Etymology
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memorize (v.)

1590s, "commit to writing, cause to be remembered by writing or inscription;" see memory + -ize. The meaning "commit to memory, learn by heart, keep in memory, have always in mind" is by 1838. Related: Memorized; memorist; memorizing.

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memorization (n.)

1823 "act or fact of memorializing;" 1857 as "action of committing to memory;" noun of action from memorize (v.).

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memorise (v.)
chiefly British English spelling of memorize; for suffix, see -ize. Related: Memorised; memorising; memorisation.
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*(s)mer- (1)

Proto-Indo-European root meaning "to remember." 

It forms all or part of: commemorate; commemoration; mourn; memo; memoir; memorable; memorandum; memorial; memorious; memorize; memory; remember.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit smarati "remembers;" Avestan mimara "mindful;" Greek merimna "care, thought," mermeros "causing anxiety, mischievous, baneful;" Latin memoria "memory, remembrance, faculty of remembering," memor "mindful, remembering;" Serbo-Croatian mariti "to care for;" Welsh marth "sadness, anxiety;" Old Norse Mimir, name of the giant who guards the Well of Wisdom; Old English gemimor "known," murnan "to mourn, remember sorrowfully;" Dutch mijmeren "to ponder."

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understudy (v.)
also under-study, 1852, in the theatrical sense "memorize a part so as to be capable of performing on short notice it in the absence of the one to which it is assigned," from under + study (v.). The noun is attested from 1848, translating Italian supplimento.
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