Etymology
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as- 
assimilated form of ad- before -s-.
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octad (n.)

"a group, system, or series of eight," 1801; see octa- + -ad.

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adware (n.)

2000 (earlier as the name of a software company), "software that automatically displays or downloads advertising," from ad (n.) + -ware, abstracted from software, etc.

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acculturation (n.)
"the adoption and assimilation of an alien culture" [OED], 1880, from assimilated form of ad- "to" + culture (n.) + noun ending -ation.
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adrenal (adj.)
"of or near the kidneys," 1866, Modern Latin, from ad- + renalis "of the kidneys," from Latin renes "kidneys" (see renal). Adrenal gland is from 1875.
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at- 
assimilated form of ad- "to, toward, before" before stems beginning in -t-; see ad-. In Old French and Middle English regularly reduced to a-, later restored.
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an- (2)
a later form of Latin ad "to" before -n- (see ad-), as in annex, announce, annihilate.
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Iliad 
from Latin Ilias (genitive Iliadis), from Greek Ilias poiesis "poem of Ilion" (Troy), literally "city of Ilius," the mythical founder. With -ad.
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a deux 
French, à deux, literally "for two," from à, from Latin ad "to, toward; for" (see ad-) + deux (see deuce). By 1876 as a French term in English.
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