Etymology
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ostinato

in musical phrases, "recurring frequently, repeated," 1876, from Italian ostinato "obstinate, persistent," from Latin obstinatus "resolute, resolved, determined, inflexible, stubborn," past participle of obstinare "to persist" (see obstinate). 

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Definitions of ostinato

ostinato (n.)
a musical phrase repeated over and over during a composition;
From wordnet.princeton.edu