Etymology
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expectant (adj.)

"having expectation, looking forward to (something) with confidence," late 14c., expectant/expectaunt, from Old French expectant or directly from Latin expectantem/exspectantem (nominative expectans/exspectans), present participle of expectare/exspectare "await, desire, hope" (see expect). Meaning "pregnant" is by 1861. Related: Expectantly. As a noun, "one who waits in expectation," from 1620s.

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Definitions of expectant

expectant (adj.)
in an advanced stage of pregnancy;
Synonyms: big / enceinte / gravid / great / large / heavy / with child
expectant (adj.)
marked by eager anticipation;
an expectant hush
Synonyms: anticipant / anticipative
From wordnet.princeton.edu