[op-er-toon, -tyoon]
appropriate, favorable, or suitable: an opportune phrase for the occasion.
occurring or coming at an appropriate time; well-timed: an opportune warning.

1375–1425; late Middle English < Latin opportūnus convenient, equivalent to op- op- + portu-, stem of portus access, port1 + -nus adj. suffix (u lengthened as in tribūnus tribune)

opportunely, adverb
opportuneness, noun
unopportune, adjective
unopportunely, adverb
unopportuneness, noun

opportune, opportunistic (see synonym study at the current entry).

1. apt; fortunate, propitious. 2. convenient. Opportune, seasonable, timely refer to something that is particularly fitting or suitable for a certain time. Opportune refers to something that is well-timed and meets exactly the demands of the time or occasion: an opportune remark. Something that is seasonable is right or proper for the time or season or occasion: seasonable weather. Something that is timely occurs or is done at an appropriate time, especially in time to meet some need: timely intervention.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
opportune (ˈɒpəˌtjuːn)
1.  occurring at a time that is suitable or advantageous
2.  fit or suitable for a particular purpose or occurrence
[C15: via Old French from Latin opportūnus, from ob- to + portus harbour (originally: coming to the harbour, obtaining timely protection)]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

c.1400, from L. opportunus "favorable," from the phrase ob portum veniens "coming toward a port," in reference to the wind, from ob "to, toward" + portus "harbor."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Some industry experts say that this is an opportune time to make a move into
  these nascent markets.
With a wretched economy and long to-do list, it hardly seems an opportune
In brief, although another site could probably be found, research to reuse the
  spent nuclear fuel would be opportune.
It is hardly an opportune time to discuss a change in compensation models.
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