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ap·ro·pos (ăp′rə-pō)
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adj.
Fitting and to the point. See Synonyms at relevant.
adv.
1. At an appropriate time; opportunely.
2. By the way; incidentally: Apropos, where were you yesterday?
prep.
With regard to; concerning: Apropos our date for lunch, I can't go.
[French à propos : à, to (from Old French a, from Latin ad; see AD-) + propos, purpose (from Latin prōpositum, from neuter past participle of prōpōnere, to intend; see PROPOSE).]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
 

Indo-European & Semitic Roots Appendices

    Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:

    Indo-European Roots

    Semitic Roots

    The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.

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