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felicitous

/fəˈlɪsɪtəs/

well-chosen, apt, or unusually happy

From Latin, through Old French and Middle English felicity (Happiness).

adjective
felicity
Proto-Indo-European
*dʰeh₁(y)-
To nurse or suckle; by extension, to produce or yield.
Latin
fēlīx (genitive felicis)
Happy, fortunate, fruitful, fertile.
Latin
fēlīcitās (accusative fēlīcitātem)
Fertility, fruitfulness, happiness, prosperity, or good fortune.
Old French
felicité
Happiness or blessedness; borrowed into English.
Middle English
felicite
Bliss, joy, good fortune, prosperity, or a source of happiness.
Modern English
felicity → felicitous
Felicity became the base for the adjective felicitous, with -ous meaning “full of” or “characterized by.”
Modern English
felicitous

Picture ancient Rome as an agricultural society where a good harvest was practically a divine endorsement. Latin fēlīx could mean both “happy” and “fruitful,” because prosperity was not an abstract mood when the grain bins were full and the vines were heavy with grapes. That word produced fēlīcitās, later French felicité and English felicity; by about 1600, felicity had also acquired the sense of skillful, perfectly appropriate expression. English then added -ous, creating felicitous: something so apt that it seems almost blessedly well-produced—especially a phrase that lands exactly where it should. The memorable link is this: felicitous language is “fruitful” language, yielding the precise effect you hoped to harvest.

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