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It seems to be now fashionable to use the word plausible to hint at two words:

  1. Possible, meaning a thing can exist but it in fact does not exist -- like for example because no one has yet invented it.

  2. Probable, meaning that it can be proven to in fact exist or to have existed, but there has not been found evidence of its existence -- yet, or evidence will never be found.

Read these entries from the Online Etymology Dictionary, http://www.etymonline.com:

Possible
possible (adj.)

mid-14c., from Old French possible and directly from Latin possibilis "that can be done," from posse "be able" (see potent). possible (n.) 1640s, from possible (adj.).

Probable
probable (adj.)

late 14c., from Old French probable "provable, demonstrable" (14c.), from Latin probabilis "worthy of approval, pleasing, agreeable, acceptable; provable, that may be assumed to be believed, credible," from probare "to try, to test" (see prove). Probable cause as a legal term is attested from 1670s.

Plausible
plausible (adj.)

1540s, "acceptable, agreeable," from Latin plausibilis "deserving applause, acceptable," from plaus-, past participle stem of plaudere "to applaud" (see plaudit). Meaning "having the appearance of truth" is recorded from 1560s. Related: Plausibly.

Do you notice that plausible originally had nothing nothing to do with the existence of a thing in regard to whether it can exist or not (possible existence), or whether it really in fact exists or had existed, but there has not been found evidence (probable existence).

  • Welcome to ELU. But... What's the question, again? Words do shift in meaning, and once they have it's impossible to move them back. – Andrew Leach Oct 9 '14 at 6:45
  • This question appears to be off-topic because it is about philosophy, not English. – phenry Oct 10 '14 at 16:26
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Possible = It is not impossible. There is no proof to suggest that it could not be achieved or that it couldn't occur.

Plausible = This doesn't sound impossible. As with "possible", there does not seem to be any proof to suggest that it could not be achieved, but it is not definitively possible - it just sounds like it is.

Probable = There is a good chance of this happening. Not 100%, but better than 50%.

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