Simple past tense and past participle of gain.(verb)
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Use "gained" in a sentence
"It is not of so much importance how soon the concept shall finally be gained as _that it is gained_."
"They gained, _gained_, gained, until their stern was opposite Harry's oar-blade."
"The term gained notoriety in the 1960s during the Pan-Arabism era as part of an effort exploit ethnic divisions to unite Arabs against non-Arabs--namely Iranians and Israelis."