1. Seemingly or apparently valid, likely, or acceptable; credible: a plausible excuse.
2. Persuasive or ingratiating, especially in an effort to deceive.
[Latin plausibilis, deserving applause, from plausus, past participle of plaudere, to applaud.]
plau′si·bili·ty, plausi·ble·ness n.
Synonyms: plausible, believable, credible
These adjectives mean appearing to merit belief or acceptance: a plausible pretext; a believable excuse; a credible assertion.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 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:
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.