Etymology
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observative (adj.)

"of or pertaining to observation," 1610s, from Latin observat-, past-participle stem of observare "watch over, note, heed, look to, attend to, guard, regard, comply with" (see observe) + -ive.

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seismograph (n.)

"instrument for measuring the motions of an earthquake," 1858, from seismo- + -graph. Based on Italian sismografo, coined and invented by Luigi Palmieri (1807-1896), director of meteorological observation on Mount Vesuvius. Related: Seismographic; seismographer; seismography (1865).

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secretly (adv.)

early 15c., secretli, "in secret, confidentially, in private, without the knowledge or observation of others," from secret (adj.) + -ly (2). Earlier was secrely (late 14c.), from secre (adj.).

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obscure (v.)

early 15c., obscuren, "to cover (something), cloud over," from obscure (adj.) or else from Old French obscurer, from Latin obscurare "to make dark, darken, obscure," from obscurus. Meaning "to conceal from knowledge or observation, disguise" is from 1520s; that of "to overshadow or outshine" is from 1540s. Related: Obscured; obscuring.

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stall (v.2)
1590s, "distract a victim and thus screen a pickpocket from observation," from stall (n.2) "decoy." Meaning "to prevaricate, be evasive, play for time" is attested from 1903. Related: Stalled; stalling. Compare old slang stalling ken "house for receiving stolen goods" (1560s).
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fishbowl (n.)

also fish-bowl, "a glass globe in which fish are kept," 1850, from fish (n.) + bowl (n.). The form goldfish-bowl is attested from 1841. Figuratively, as a place where one is under constant observation, by 1957. Fish-globe is by 1858.

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scopophilia (n.)

"voyeurism, sexual urge or satisfaction chiefly from looking and seeing," 1924 (in a translation of Freud), from a word-forming element made from a Latinized form of Greek -skopia "observation" (from PIE root *spek- "to observe") + -philia. In early use often scoptophilia through a mistake by Freud's translators. The corrected form is by 1937. Related: Scopophiliac; scopophile.

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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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notability (n.)

mid-14c., notabilite, "a noteworthy observation or circumstance," from Old French notabilite and directly from Medieval Latin *notabilitatem (nominative *notabilitas), from Latin notabilis "noteworthy" (see notable). From early 15c. as "excellence, pre-eminence." In late 18c.-early 19c. also "housewifely industry."

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advisement (n.)

early 14c., avisement, "examination, inspection, observation," from Old French avisement "consideration, reflection; counsel, advice," from aviser "deliberate, reflect, consider," from avis "opinion" (see advice). Meaning "advice, counsel" is from c. 1400, as is that of "consultation, conference," now obsolete except in legalese phrase under advisement. The unetymological -d- is a 16c. scribal overcorrection.

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