disposable (adj.) Look up disposable at Dictionary.com
1640s, "that may be done without;" see dispose + -able. Meaning "designed to be discarded after one use" is from 1943, originally of diapers, soon of everything; replaced throw-away (1928) in this sense. First recorded use of disposable income (preserving the older sense) is from 1948.
disposal (n.) Look up disposal at Dictionary.com
1620s, "power to make use of;" see dispose + -al (2); of waste material, from c.1960, originally in medical use.
dispose (v.) Look up dispose at Dictionary.com
late 14c., from Old French disposer (13c.) "arrange, order, control, regulate" (influenced in form by poser "to place"), from Latin disponere "put in order, arrange, distribute," from dis- "apart" (see dis-) + ponere "to put, place" (see position). Related: Disposed; disposing.
disposed (adj.) Look up disposed at Dictionary.com
mid-14c., "inclined, in the mood," past participle adjective from dispose. Meaning "in a certain condition" is late 14c.; "arranged" is 15c.
disposition (n.) Look up disposition at Dictionary.com
late 14c., "ordering, management," also "tendency of mind," from Old French disposicion (12c.) "arrangement, order; mood, state of mind," from Latin dispositionem (nominative dispositio) "arrangement, management," noun of action from past participle stem of disponere "to put in order, arrange" (see dispose). References to "temperament" (late 14c. in English) are from astrological use of the word for "position of a planet as a determining influence."
dispossess (v.) Look up dispossess at Dictionary.com
late 15c., from Old French despossesser "to dispossess," from des- (see dis-) + possesser (see possess). Related: Dispossessed; dispossessing.
dispossession (n.) Look up dispossession at Dictionary.com
1570s, noun of action from dispossess.
disproof (n.) Look up disproof at Dictionary.com
1530s; see dis- + proof.
disproportion (n.) Look up disproportion at Dictionary.com
1550s; see dis- + proportion.
disproportionate (adj.) Look up disproportionate at Dictionary.com
1550s, from dis- "not" + proportionate. Improportionate in same sense is from late 14c. Related: Disproportionately.
disprove (v.) Look up disprove at Dictionary.com
late 14c., from Old French desprover "refute, contradict," from des- (see dis-) + prover (see prove). Related: Disproved; disproving.
disputant (n.) Look up disputant at Dictionary.com
1610s, from Latin disputantem (nominative disputans), present participle of disputare (see dispute).
disputation (n.) Look up disputation at Dictionary.com
late 14c., from Old French desputasion and directly from Latin disputationem (nominative disputatio), noun of action from past participle stem of disputare (see dispute).
dispute (v.) Look up dispute at Dictionary.com
c.1300, from Old French desputer (12c.) "dispute, fight over, contend for, discuss," from Latin disputare "weigh, examine, discuss, argue, explain," from dis- "separately" (see dis-) + putare "to count, consider," originally "to prune" (see pave).

Used in Vulgate in sense of "to argue, contend with words." Related: Disputable; disputed; disputing. The noun is not certainly recorded before 1590s (disputacioun in that sense is from late 14c.).
disqualification (n.) Look up disqualification at Dictionary.com
1710s, agent noun from disqualify.
disqualify (v.) Look up disqualify at Dictionary.com
1718 (implied in disqualified), from dis- + qualify. Related: Disqualifying.
disquiet (v.) Look up disquiet at Dictionary.com
1520s, from dis- + quiet. Related: Disquieted; disquieting. As a noun, from 1570s.
disquietude (n.) Look up disquietude at Dictionary.com
1709; from disquiet on model of quietude.
disquisition (n.) Look up disquisition at Dictionary.com
c.1600, "subject for investigation," also "systematic search," from Latin disquisitionem (nominative disquisitio) "an inquiry, investigation," noun of action from past participle stem of disquirere "inquire," from dis- "apart" (see dis-) + quaerere "seek, ask" (see query (v.)). Sense of "long speech" first recorded 1640s.
disregard (v.) Look up disregard at Dictionary.com
1640s, from dis- + regard. Related: Disregarded; disregarding. As a noun, from 1660s.
disremember (v.) Look up disremember at Dictionary.com
1815, American English colloquialism, from dis- + remember.
disrepair (n.) Look up disrepair at Dictionary.com
1798, from dis- + repair (n.).
disreputable (adj.) Look up disreputable at Dictionary.com
1710 (implied in disreputableness); see dis- + reputable. Related: Disreputably.
disrepute (n.) Look up disrepute at Dictionary.com
1650s, from dis- + repute (n.).
disrespect Look up disrespect at Dictionary.com
1610s (v.), 1630s (n.), from dis- + respect. Related: Disrespected; disrespecting.
disrespectful (adj.) Look up disrespectful at Dictionary.com
1670s; see dis- + respectful. Related: Disrespectfully.
disrobe (v.) Look up disrobe at Dictionary.com
1580s in intransitive sense of "to undress" (oneself); see dis- + robe. Related: Disrobed; disrobing. Transitive sense is from 1580s.
disrupt (v.) Look up disrupt at Dictionary.com
1650s, but rare before c.1820, from Latin disruptus, past participle of disrumpere (see disruption). Or perhaps a back-formation from disruption. Related: Disrupted; disrupting.
disruption (n.) Look up disruption at Dictionary.com
early 15c., from Latin disruptionem (nominative disruptio) "a breaking asunder," noun of action from past participle stem of disrumpere "break apart, split, shatter, break to pieces," from dis- "apart" (see dis-) + rumpere "to break" (see rupture (n.)).
disruptive (adj.) Look up disruptive at Dictionary.com
1862 (in electricity sense from 1842); see disrupt + -ive. Related: Disruptively; disruptiveness.
dissatisfaction (n.) Look up dissatisfaction at Dictionary.com
1630s; see dis- + satisfaction.
dissatisfy (v.) Look up dissatisfy at Dictionary.com
1660s; see dis- + satisfy. Related: Dissatisfied; dissatisfying.
dissect (v.) Look up dissect at Dictionary.com
c.1600, from Latin dissectus, past participle of dissecare "to cut to pieces" (see dissection). Or perhaps a back-formation from dissection. Related: Dissected; dissecting.
dissection (n.) Look up dissection at Dictionary.com
1580s, from Middle French dissection, from Medieval Latin dissectionem (nominative dissectio), noun of action from past participle stem of Latin dissecare "cut in pieces," from dis- "apart" (see dis-) + secare "to cut" (see section).
dissemble (v.) Look up dissemble at Dictionary.com
early 15c. (implied in dissemblable), apparently a variant of Middle English dissimule (influenced by Middle French dessembler or English resemble), late 14c., from Old French dissimuler, from Latin dissimulare (see dissimulation). Related: Dissembled; dissembling.
dissembler (n.) Look up dissembler at Dictionary.com
1520s, agent noun from dissemble.
disseminate (v.) Look up disseminate at Dictionary.com
c.1600, from Latin disseminatus, past participle of disseminare "to spread abroad, disseminate," from dis- "in every direction" (see dis-) + seminare "to plant, propagate," from semen (genitive seminis) "seed" (see semen). Related: Disseminated; disseminates; disseminating. Middle English had dissemen "to scatter" (early 15c.).
dissemination (n.) Look up dissemination at Dictionary.com
1640s, from Latin disseminationem (nominative disseminatio) "a scattering of seed, a sowing," noun of action from past participle stem of disseminare (see disseminate). Or perhaps a native noun formation from disseminate.
dissension (n.) Look up dissension at Dictionary.com
early 14c., from Old French dissension (12c.) and directly from Latin dissensionem (nominative dissensio) "disagreement, difference of opinion, discord, strife," noun of action from past participle stem of dissentire "disagree" (see dissent).
dissent (v.) Look up dissent at Dictionary.com
early 15c., from Latin dissentire "differ in sentiments, disagree, be at odds, contradict, quarrel," from dis- "differently" (see dis-) + sentire "to feel, think" (see sense (n.)). Related: Dissented; dissenting. The noun is 1580s, from the verb.
Has there ever been a society which has died of dissent? Several have died of conformity in our lifetime. [Jacob Bronowski "Science and Human Values," 1956]
dissenter (n.) Look up dissenter at Dictionary.com
1630s, in 17c. especially of religions (with a capital D- from 1670s); agent noun from dissent.
dissertation (n.) Look up dissertation at Dictionary.com
1610s, "discussion, debate," from Latin dissertationem (nominative dissertatio) "discourse," noun of action from past participle stem of dissertare "debate, argue, examine, harangue," frequentative of disserere "discuss, examine," from dis- "apart" (see dis-) + serere "to arrange words" (see series). Sense of "formal, written treatise" is 1650s.
disservice (n.) Look up disservice at Dictionary.com
1590s; see dis- + service. Perhaps formed on analogy of French desservice (16c.).
dissever (v.) Look up dissever at Dictionary.com
late 13c., from Anglo-French deseverer, Old French dessevrer (10c.), from des- (see dis-) + sevrer (see sever). Related: Dissevered; dissevering; disseverance; disseveration.
dissidence (n.) Look up dissidence at Dictionary.com
1650s, from Latin dissidentia "diversity, contrariety," from dissidens, present participle of dissidere (see dissident).
dissident (adj.) Look up dissident at Dictionary.com
1530s, from Latin dissidentem (nominative dissidens), present participle of dissidere "to be remote; disagree, be removed from," literally "to sit apart," from dis- "apart" (see dis-) + sedere "to sit" (see sedentary).
dissident (n.) Look up dissident at Dictionary.com
1766, in reference to Protestants, from dissident (adj.). In the political sense first used 1940, coinciding with the rise of 20c. totalitarian systems, especially with reference to the Soviet Union.
dissimilar (adj.) Look up dissimilar at Dictionary.com
1620s, from dis- + similar; perhaps on analogy of French dissimilaire. Related: Dissimilarity.
dissimilate (v.) Look up dissimilate at Dictionary.com
"make different," 1821, from dis- + Latin similis on model of assimilate. Related: Dissimilated; dissimilating; dissimilation (1806).
dissimilation (n.) Look up dissimilation at Dictionary.com
1874, noun of action from dissimilate.