Etymology
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asea (adj.)

"at or to the sea," by 1809, from a- (1) "on" + sea.

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phenomena (n.)
classical plural of phenomenon (see -a (2)). Sometimes also erroneously used as a singular.
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achromatic (adj.)
1766, from a- (3) "not, without" + chromatic. Related: Achromatically.
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atemporal (adj.)
"timeless," 1870, from a- (3) "not" + temporal. Related: Atemporally.
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atonal (adj.)
in musical composition, "not considering scale or tone," 1911, from a- (3) "not, without" + tonal.
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abuilding (adj.)
"in the process of being built," 1530s, from a- (1) + building (n.) in the "process of construction" sense.
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asepsis (n.)
"absence of micro-organisms causing putrefaction or fermentation," 1855, from a- (3) "not" + sepsis.
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astern (adv.)
"toward the hinder part of a ship," 1620s, from a- (1) "on" + stern (n.).
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agape (adv.)
"with the mouth wide open" (as in wonder), 1660s, from a- (1) + gape (v.).
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aborning (adv.)
"while being born," 1893, American English; see a- (1) + born + -ing (2).
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