punctual (adj.)

c. 1400, "having a sharp point; producing punctures," senses now rare or obsolete, from Medieval Latin punctualis, from Latin punctus "a pricking" (from nasalized form of PIE root *peuk- "to prick").

The meaning "prompt" is recorded by 1670s, from the notion of "exact, precise, insisting on fine points," including the observation of time and the keeping of appointments (c. 1600). Related: Punctually.

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Definitions of punctual from WordNet

punctual (adj.)
acting or arriving or performed exactly at the time appointed;
he is not a particularly punctual person
she expected guests to be punctual at meals
punctual payment
Synonyms: on time