Etymology
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Words related to scan

lawn (n.1)
"turf, stretch of grass," 1540s, laune "glade, open space in a forest or between woods," from Middle English launde (c. 1300), from Old French lande "heath, moor, barren land; clearing" (12c.), from Gaulish (compare Breton lann "heath"), or from a cognate Germanic word, from Proto-Germanic *landam-, source of English land (n.). The -d perhaps was mistaken for an affix and dropped. Sense of "grassy ground kept mowed" first recorded 1733. Lawn-tennis is from 1884.
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ascend (v.)
late 14c., "move upward," from Latin ascendere "to climb up, mount," of planets, constellations, "come over the horizon," figuratively "to rise, reach," from ad "to" (see ad-) + scandere "to climb" (see scan (v.)). Also in 15c. used with a sense "to mount (a female) for copulation." Meaning "slope upward" is from 1832. Related: Ascended; ascending. An Old English word for it was stigan.
condescend (v.)

mid-14c., of God, a king., etc., "make gracious allowance" for human frailty, etc.; late 14c., "yield deferentially," from Old French condescendere (14c.) "to agree, consent, give in, yield, come down from one's rights or claims," and directly from Late Latin condescendere "to let oneself down, stoop," in Medieval Latin "be complaisant or compliant," from assimilated form of Latin com "with, together" (see con-) + descendere "to descend," literally "climb down," from de "down" (see de-) + scandere "to climb," from PIE root *skand- "jump" (see scan (v.)).

Sense of ""voluntarily waive ceremony or dignity proper to one's superior position or rank and willingly assume equality with inferiors" is from early 15c. Generally a positive word in Middle English; the modern, negative sense is from the notion of a mere show or assumed air of condescending (compare sense evolution in patronize). Also in Middle English "give one's consent; come to mutual agreement; make a concession."

descend (v.)

c. 1300, descenden, "move or pass from a higher to a lower place," from Old French descendre (10c.) "descend, dismount; fall into; originate in" and directly from Latin descendere "come down, descend, sink," from de "down" (see de-) + scandere "to climb," from PIE root *skand- "jump" (see scan (v.)).

Sense of "originate, proceed from a source or original" is late 14c. in English, as is that of "have a downward slope." Meaning "come down in a hostile manner, invade" is from early 15c. Related: Descended; descending.

echelon (n.)
1796, echellon, "step-like arrangement of troops," from French échelon "level, echelon," literally "rung of a ladder," from Old French eschelon, from eschiele "ladder," from Late Latin scala "stair, slope," from Latin scalae (plural) "ladder, steps," from PIE *skand- "to spring, leap" (see scan (v.)). Sense of "level, subdivision" is from World War I.
escalade (n.)

1590s, "action of using ladders to scale the walls of a fortified place," from French escalade (16c.) "an assault with ladders on a fortification," from Italian scalata, fem. past participle of scalare "to climb by means of a ladder," from scala "ladder," related to Latin scandere "to climb" (see scan). For initial e-, see e-. Also in early use in English in Spanish form escalada, later corrupted to escalado. As the name of a brand of luxury SUV by Cadillac, from 1999.

scale (v.1)

"to climb (a wall) by or as by a ladder; attack with scaling ladders," late 14c., scalen, from Latin scala "ladder, flight of stairs," from *scansla, from stem of scandere "to climb" (see scan (v.)).

Middle English scale, "ladder used in sieges," is attested c. 1400, from the Latin noun. The verb in general and figurative use (of mountains, heights of pleasure, etc.) is from 16c.

Via scale (n.3) "standard of measure or estimation" comes the meaning "measure or regulate by a scale" (1798), the sense of "draw, project, or make according to scale" (by 1885), and scale down "cut or decrease proportionally in every part" (by 1887). Related: Scaled; scaling.

scale (n.3)

[standard of measure or estimation] late 14c., "series of registering marks; marks laid down to determine distance along a line," (in Chaucer's description of the astrolabe), from Latin scala "ladder, flight of stairs," from *scansla, from stem of scandere "to climb" (see scan (v.)). 

The noun in the classical Latin sense is rare, though Middle English had it as "ladder used in sieges" (c. 1400). The meaning "succession or series of steps ascending or descending" is from c. 1600; that of "standard for estimation" (large scale, small scale, etc.) is from 1620s.

The musical sense of "definite and standard series of tones within a certain range," typically an octave (1590s), and the meaning "proportion of a representation to the actual object" (1660s) are via Italian scala, from Latin scala.

scandal (n.)

1580s, "damage to one's reputation," from French scandale, from Late Latin scandalum "cause for offense, stumbling block, temptation," from Greek skandalon "a stumbling block, offense; a trap or snare laid for an enemy."

The Greek noun in this form seems to be attested first in Septuagint (25 times) and the Greek New Testament (15 times) as "cause of moral stumblings," translating a Hebrew word meaning "a noose, a snare." The Biblical use is presumably figurative or metaphoric, and OED and others conclude that it is "certainly an old word meaning 'trap' " or a variant of one. Presumably, then, originally "trap with a springing device" (compare related skandalē "stick of a trap," the trigger which is pulled by the cord to spring it), if it is from PIE *skand- "to leap, climb" (see scan (v.), as is proposed in Watkins (Beekes is skeptical); also see slander (n.), which is another form of the same word.

The word is used in Ancrene Riwle (c. 1200), scandle, "discredit to religion resulting from bad behavior by a religious person," from Old French escandle, eschandle (12c.); Anglo-French scandle, and Latin scandalum. But the modern word likely is a new borrowing.

The meanings "malicious gossip" and "shameful condition, action, or event; that which causes scandal" are from 1590s; the sense of "person whose conduct is a disgrace" is by 1630s. Scandal sheet "sensational newspaper" is by 1884. Scandal-monger is from 1702.

scanner (n.)

1550s, "person who examines critically," agent noun from scan (v.). From 1927 as a type of mechanical device, at first often in television technology, by mid-20c. used of radar and radiation imaging devices; later of computer digital readers.