Etymology
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ambiguity (n.)

c. 1400, "uncertainty, doubt, indecision, hesitation," from Old French ambiguite and directly from Latin ambiguitatem (nominative ambiguitas) "double meaning, equivocalness, double sense," noun of state from ambiguus "having double meaning, doubtful" (see ambiguous). The meaning "obscurity in description" is from early 15c.

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ambiguous (adj.)

"of doubtful or uncertain nature, open to various interpretations," 1520s, from Latin ambiguus "having double meaning, shifting, changeable, doubtful," an adjective derived from ambigere "to dispute about, contend, debate," literally "to wander, go about, go around," figuratively "hesitate, waver, be in doubt," from ambi- "about" (from PIE root *ambhi- "around") + agere "drive, lead, act" (from PIE root *ag- "to drive, draw out or forth, move"). The English word is first attested in Sir Thomas More (1528); related ambiguity dates to c. 1400. Related: Ambiguously; ambiguousness.

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directness (n.)

1590s, "straightness;" 1610s, "freedom from ambiguity;" see direct (adj.) + -ness

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disambiguate (v.)

"remove ambiguity from," 1963, back-formation from disambiguation. Related: Disambiguated; disambiguating.

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flammable (adj.)

1813, from stem of Latin flammare "to set on fire" (from flamma "flame, blazing fire;" see flame (n.)) + -able. In modern (20c.) use, a way to distinguish from the ambiguity of inflammable.

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decided (adj.)

"resolute, free from hesitation or wavering," 1790, past-participle adjective from decide. A decided victory is one the reality of which is not in doubt; a decisive one goes far toward settling some issue. Meaning "free from ambiguity or uncertainty" also is from 1790. Related: Decidedly.

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glam (adj.)

slang shortening of glamorous, first attested 1936. Glam rock ("characterized by male performers dressed in glamorous clothes, with the suggestion of androgyny or sexual ambiguity" - OED), attested by 1974. Glamazon "glamourous, dominant woman" attested by 1985 (based on amazon).

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antinomy (n.)

1590s, "contradiction in the laws," from Latin antinomia, from Greek antinomia "ambiguity in the law," from anti "against" (see anti-) + nomos "law" (from PIE root *nem- "assign, allot; take"). From 1802 in the philosophical sense used by Kant, "contradiction between logical conclusions." Related: Antinomic.

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duplicity (n.)

"deceptiveness, character or practice of speaking differently of the same thing or acting differently at different times or to different persons," early 15c., from Old French duplicite (13c.), from Late Latin duplicitatem (nominative duplicitas) "doubleness," in Medieval Latin "ambiguity," noun of quality from duplex (genitive duplicis) "twofold," from duo "two" (from PIE root *dwo- "two") + -plex, from PIE root *plek- "to plait." The notion is "a state of being double" in one's conduct (compare Greek diploos "treacherous, double-minded," literally "twofold, double").

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