strictly observant of an appointed or regular time; not late; prompt.
made, occurring, etc., at the scheduled or proper time: punctual payment.
pertaining to or of the nature of a point.

1350–1400; Middle English < Medieval Latin pūnctuālis of a point, equivalent to Latin pūnctu(s) a point, a pricking (pung(ere) to prick + -tus suffix of v. action) + -ālis -al1; see pungent

punctually, adverb
punctualness, noun
nonpunctual, adjective
nonpunctually, adverb
nonpunctualness, noun
unpunctual, adjective
unpunctually, adverb
unpunctualness, noun

punctilious, punctual.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
punctual (ˈpʌŋktjʊəl)
1.  arriving or taking place at an arranged time; prompt
2.  (of a person) having the characteristic of always keeping to arranged times, as for appointments, meetings, etc
3.  obsolete precise; exact; apposite
4.  maths consisting of or confined to a point in space
[C14: from Medieval Latin punctuālis concerning detail, from Latin punctum point]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1400, from M.L. punctualis (c.1210), from L. punctus "a pricking" (see point). Originally "having a sharp point;" meaning "prompt" first recorded 1675, from notion of "insisting on fine points." Punctuality "exactness" is from 1620.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
She was always punctual, and always sat alone in the pews in the shadows, out
  of the multicolored light of the lampshades.
In his own house, he insisted on punctual appointments.
When the anniversary arrived, both parties were punctual to their engagement.
Buses and trains are not known to be punctual or to run on a set schedule.
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