Etymology
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speculum (n.)
1590s, in surgery and medicine, "instrument for rendering a part accessible to observation," from Latin speculum "reflector, looking-glass, mirror" (also "a copy, an imitation"), from specere "to look at, view" (from PIE root *spek- "to observe"). As a type of telescope attachment from 1704.
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monitor (v.)

1924, "to check for quality" (originally especially of radio signals), from monitor (n.). General sense of "observe, keep under review" is from 1944. Keats used it (1818) as "to guide." Related: Monitored; monitoring.

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aspect (n.)
Origin and meaning of aspect
late 14c., an astrological term, "relative position of the planets as they appear from earth" (i.e., how they "look at" one another); also "one of the ways of viewing something," from Latin aspectus "a seeing, looking at, sight, view; countenance; appearance," from past participle of aspicere "to look at, look upon, behold; observe, examine," figuratively "consider, ponder," from ad "to" (see ad-) + specere "to look" (from PIE root *spek- "to observe"). Meanings "the look one wears; the appearance of things" are attested by early 15c. Sense of "a facing in a given direction" is from 1660s.
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caveat (n.)

"warning, hint of caution," 1550s, Latin, literally "let him beware," 3rd person singular present subjunctive of cavere "to beware, take heed, watch, guard against," from PIE root *keu- "to see, observe, perceive." Legal sense "public warning preventing some action" is from 1650s.

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show (v.)

Old English sceawian "to look at, see, gaze, behold, observe; inspect, examine; look for, choose," from Proto-Germanic *skauwojan (source also of Old Saxon skauwon "to look at," Old Frisian skawia, Dutch schouwen, Old High German scouwon "to look at"), from Proto-Germanic root *skau- "behold, look at," from PIE *skou-, variant of root *keu- "to see, observe, perceive."

Causal meaning "let be seen; put in sight, make known" evolved c. 1200 for unknown reasons and is unique to English (German schauen still means "look at"). Spelling shew, popular 18c. and surviving into early 19c., represents obsolete pronunciation (rhymes with view). Horse racing sense is from 1903, perhaps from an earlier sense in card-playing.

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considerable (adj.)

mid-15c., "capable of being considered, conceivable," from Medieval Latin considerabilis "worthy to be considered," from Latin considerare "to look at closely, observe," probably literally "to observe the stars," from assimilated form of com "with, together" (see con-) + sidus (genitive sideris) "heavenly body, star, constellation" (see sidereal).

Meaning "pretty large" is from 1650s (implied in considerably), from now-archaic earlier sense of "Worthy of regard or attention" (1610s).

CONSIDERABLE. This word is still frequently used in the manner pointed out by Dr. Witherspoon in the following remark: "He is considerable of a surveyor; considerable of it may be found in the country. This manner of speaking prevails in the northern parts." [Pickering, "A Vocabulary, or Collection of Words and Phrases Which Have Been Supposed to be Peculiar to the United States of America," 1816]
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retrospection (n.)

1630s, "action of looking back," noun of action from past-participle stem of Latin retrospicere "look back," from retro "back" (see retro-) + specere "look at" (from PIE root *spek- "to observe"). Specifically "act of looking back on times past" (1729).

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considerate (adj.)

1570s, "marked by deliberation," from Latin consideratus, past participle of considerare "to look at closely, observe" (see consider). Of persons, "deliberate, prudent, given to consideration" 1580s; meaning "not unfeeling or rigorous, showing consideration for the circumstances or feelings of others" is from c. 1700. Related: Considerately; considerateness.

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annotation (n.)

mid-15c., "a written comment," from Latin annotationem (nominative annotatio), noun of action from past-participle stem of annotare "to observe, remark," from ad "to" (see ad-) + notare "to mark, note, make a note," from nota "mark, sign, means of recognition" (see note (n.)). Related: Annotations.

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circumspect (adj.)

"cautious, wary," literally "looking about on all sides," early 15c., from Latin circumspectus "deliberate, guarded, well-considered," past participle of circumspicere "look around, take heed," from circum "around, round about" (see circum-) + specere "to look" (from PIE root *spek- "to observe"). Related: Circumspectly; circumspectness.

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