Etymology
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Words related to omen

abominable (adj.)
Origin and meaning of abominable
mid-14c., "exciting disgust or loathing, morally detestable," from Old French abominable (12c.) and directly from Late Latin abominabilis "deserving abhorrence," from stem of Latin abominari "deplore (as an evil omen)," hence, generally, "detest, execrate, deprecate," from ab "off, away from" (see ab-) + omin-, stem of omen (see omen).

The more common Middle English form was abhominable, which persisted into 17c.; it is a folk-etymology, as if from Latin ab homine "away from man" (thus "beastly"). In early Modern English sometimes misdivided as a bominable. Related: Abominably; abominableness. Abominable snowman (1921) translates Tibetan meetaoh kangmi.
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abomination (n.)
Origin and meaning of abomination

early 14c., "abominable thing or action;" late 14c., "feeling of disgust, hatred, loathing," from Old French abominacion "abomination, horror, repugnance, disgust" (13c.), from Latin abominationem (nominative abominatio) "abomination," noun of action from past-participle stem of abominari "shun as an ill omen," from ab "off, away from" (see ab-) + omin-, stem of omen (see omen).

In biblical use, often "that which is ceremonially impure." The meaning was intensified by folk etymology derivation from Latin ab homine "away from man" (thus "beastly"); Wyclif and Chaucer both have abhominacioun, and abhominable was mocked by Shakespeare in "Love's Labour's Lost."

absit omen (interj.)
Latin, literally "may this omen be absent." Added to an expression of something one does not wish to be true or come true, "may it not be ominous;" from third person singular present subjunctive of abesse "be away" (see absent (adj.)) + omen (see omen).
ominous (adj.)
Origin and meaning of ominous

"conveying an omen, significant," 1580s, from Latin ominosus "full of foreboding," from omen (genitive ominis) "foreboding" (see omen (n.)). Especially (and now exclusively) "of ill omen, giving indication of coming evil." Related: Ominousness.