Specialize

google

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early 17th century: from French spécialiser, from spécial ‘special’.

wiktionary

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special +‎  -ize

etymonline

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specialize (v.)

1610s, "to indicate specially," from special (adj.) + -ize, perhaps on model of French spécialiser. Sense of "engage in a special study or line of business" is first attested 1881; biological sense is from 1851. Related: Specialized; specializing.