mid-15c., "relative, having relation or reference to something" (a sense now obsolete), from Medieval Latin respectivus "having regard for," from Latin respect- past-participle stem of respicere "look back at, regard, consider" (see respect (v.)). The meaning "relating or pertaining severally each to each, connected with each of those in question" is from 1640s.

1530s, "digestion" (a sense now obsolete), from Latin concoctionem (nominative concoctio) "digestion," noun of action from past participle stem of concoquere "to digest; to boil together, prepare; to consider well," from assimilated form of com "together" (see con-) + coquere "to cook, prepare food, ripen, digest," from PIE root *pekw- "to cook, ripen."

Meaning "that which is concocted" is by 1850, figurative; meaning "a devising, a planning, act of preparing and combining the materials of anything" is from 1823.

"system of combined links," 1874, originally in mechanical engineering, from link (v.) + -age.

To understand the principle of Peaucellier's link-work, it is convenient to consider previously certain properties of a linkage, (to coin a new and useful word of general application), consisting of an arrangement of six links, obtained in the following manner ... (etc.). ["Recent Discoveries in Mechanical Conservation of Motion," in "Van Nostrand's Eclectic Engineering Magazine," vol. xi, July-December 1874]

late 14c., pensif, "sad, sorrowful, melancholy;" also "engaged in serious thought, meditative, contemplative;" from Old French pensif "thoughtful, distracted, musing" (11c.), from penser "to think," from Latin pensare "weigh, consider," frequentative of pendere "to hang, cause to hang; weigh; pay" (from PIE root *(s)pen- "to draw, stretch, spin"). Meaning "expressing thoughtfulness with sadness" is from 1540s. Related: Pensively; pensiveness.

in English writing, a characteristic German word used to command attention, from German achtung, from acht (n.) "attention, care, heed, consideration," achten (v.) "pay attention to, regard, esteem, respect," from Old High German ahton "pay attention to," a general Germanic word akin to Old English eahtian "to estimate, esteem, consider, praise," but with no living native descendants in English.

"a syllogism in which one premise is omitted," in Aristotle, "an inference from likelihoods and signs," 1580s, from Latin enthymema, from Greek enthymema "thought, argument, piece of reasoning," from enthymesthai "to think, consider," literally "to keep in mind, take to heart," from en "in" (see en- (2)) + thymos "spirit, courage, anger, sense" (from PIE root *dheu- (1) "dust, vapor, smoke"). Related: Enthymematic.

1776, "to tutor," from Latin intuit-, past participle stem of intueri "look at, consider," from in- "at, on" (from PIE root *en "in") + tueri "to look at, watch over" (see tutor (n.)). Meaning "to perceive directly without reasoning, know by immediate perception" is from 1840 (De Quincey), in this sense perhaps a back-formation from intuition. Related: Intuited; intuiting.

c. 1300, revilen, "debase, degrade" (a sense now obsolete);" mid-14c., "insult, taunt, vilify, assail with abusive language," from Old French reviler "consider vile, despise, scorn," from re-, here perhaps an intensive prefix (see re-), + aviler "make vile or cheap, disesteem," from vil "shameful, dishonorable; low-born; cheap; ugly, hideous" (see vile (adj.)). Related: Reviled; reviler; reviling.

c. 1400, "to consider, contemplate," from Anglo-French surveier, Old French sorveoir "look (down) at, look upon, notice; guard, watch," from Medieval Latin supervidere "oversee, inspect," from Latin super "over" (see super-) + videre "to see" (from PIE root *weid- "to see"). Meaning "examine the condition of" is from mid-15c. That of "to take linear measurements of a tract of ground" is recorded from 1540s. Related: Surveyed; surveying; surveyance (late 14c.).

1580s, "to ponder, think abstractly, engage in mental contemplation" (intransitive), probably a back-formation from meditation, or else from Latin meditatus, past participle of meditari "to meditate, think over, reflect, consider," frequentative form of PIE root *med- "take appropriate measures." From 1590s as "to plan in the mind," also "to employ the mind in thought or contemplation," especially in a religious way. Related: Meditated; meditating.