Etymology
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Words related to possible

potent (adj.)

early 15c., "mighty, very powerful, possessed of inherent strength," from Latin potentem (nominative potens) "powerful," present participle of *potere "be powerful," from potis "powerful, able, capable; possible;" of persons, "better, preferable; chief, principal; strongest, foremost," from PIE root *poti- "powerful; lord." Meaning "having sexual power, capable of orgasm in sexual intercourse" (of men) is recorded by 1893.

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impossible (adj.)

late 14c., from Old French impossible (14c.), from Latin impossibilis "not possible," from assimilated form of in- "not, opposite of" (see in- (1)) + possibilis (see possible). Weakened sense of "unable to be accomplished or tolerated" is from mid-19c. Related: Impossibly.

possibility (n.)

late 14c., "state, fact, or condition of being possible," from Old French possibilité (13c.) and directly from Latin possibilitatem (nominative possibilitas) "possibility," from possibilis (see possible (adj.)). Meaning "a possible thing or substance; that which may take place or come into being" is from c. 1400. Related: Possibilities.

possibly (adv.)

c. 1400, possibli, "by any existing power or means, in a possible manner," from possible (adj.) + -ly (2). By c. 1600 as "perhaps. perchance."

*poti- 

Proto-Indo-European root meaning "powerful; lord." 

It forms all or part of: bashaw; compos mentis; despot; hospodar; host (n.1) "person who receives guests;" idempotent; impotent; omnipotent; pasha; plenipotentiary; posse; possess; possible; potence; potency; potent; potentate; potential; potentiate; potentiometer; power; totipotent

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit patih "master, husband;" Greek posis, Lithuanian patis "husband;" Latin potis "powerful, able, capable; possible."