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1. Acting or arriving exactly at the time appointed; prompt.
2. Paid or accomplished at or by the appointed time.
3. Precise; exact.
4. Confined to or having the nature of a point in space.
5. Linguistics Of, related to, or being the verbal aspect that expresses momentary action or action considered as having no temporal duration.

[Middle English, sharp-pointed, from Medieval Latin pūnctuālis, from Latin pūnctum, point, from neuter past participle of pungere, to prick; see pungent.]

punc′tu·al′i·ty (-ăl′ĭ-tē), punc′tu·al·ness (-əl-nĭs) n.
punc′tu·al·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in classic literature ?
What to my backward glance seems startling and a little awful is their punctualness and inevitability.