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[ir-i-doo-suh-buh l, -dyoo-] /ˌɪr ɪˈdu sə bəl, -ˈdyu-/

not reducible; incapable of being reduced or of being diminished or simplified further:
the irreducible minimum.
incapable of being brought into a different condition or form.

not able to be reduced or lessened
not able to be brought to a simpler or reduced form


1530s, from assimilated form of in- (1) “not, opposite of” + reducible. Related: Irreducibly; irreducibility.

irreducible ir·re·duc·i·ble (ĭr’ĭ-dōō’sə-bəl, -dyōō’-)

ir’re·duc’i·bil’i·ty or ir’re·duc’i·ble·ness n.
ir’re·duc’i·bly adv.


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  • Irreflexive

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  • Irreformable

    [ir-i-fawr-muh-buh l] /ˌɪr ɪˈfɔr mə bəl/ adjective 1. insusceptible to reforming influences; incorrigible. 2. not subject to improvement; final; perfect: irreformable doctrine.

  • Irrefragable

    [ih-ref-ruh-guh-buh l] /ɪˈrɛf rə gə bəl/ adjective 1. not to be disputed or contested. /ɪˈrɛfrəɡəbəl/ adjective 1. not able to be denied or refuted; indisputable adj. “that cannot be refuted,” 1530s, from Late Latin irrefragabilis, from assimilated form of in- “not, opposite of” (see in- (1)) + Latin refragari “to oppose, contest,” from re- “back” […]

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