Precisely means with exact accuracy, down to the smallest detail. At precisely nine, precisely measured, precisely the same.
It is also a one-word reply meaning exactly that — Precisely. — used to agree emphatically with what somebody has just worked out. Not precisely is a way of correcting somebody gently. Note precise, the adjective; precision, the noun; and that precisely often marks the speaker's insistence rather than any real difference — precisely at nine and at nine mean the same thing to everybody except the speaker.
1adverbpreciselyWith exact accuracy.
“The whole thing takes precisely four minutes every time.”
synonyms: exactly, accurately
2adverbagreeUsed to agree emphatically.
“That is precisely what nobody wanted to hear.”
Too few real examples of this word to estimate which sense is commonest.
precisely is a degree of exactness.
Also accepted in games: exactly
Proto-Indo-European
*preh₂-
Latin
praecīsus
Middle French
précis
English
precise
English, today
precisely
From precise + -ly. precise comes from Middle French précis, from Latin praecīsus, perfect passive participle of praecīdere, from prae- + caedere, cognate with hit. Related to incise. a doublet of précis.
Etymology from Wiktionary, CC BY-SA