Contain

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Middle English: from Old French contenir, from Latin continere, from con- ‘altogether’ + tenere ‘to hold’.

wiktionary

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From Middle English, borrowed from Old French contenir, from Latin continere(“to hold or keep together, comprise, contain”), combined form of con-(“together”) + teneō(“to hold”).

etymonline

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contain (v.)

c. 1300, "restrain (someone), control (oneself), behave (in a certain way)," from Old French contein-, tonic stem of contenir, from Latin continere (transitive) "to hold together, enclose," from assimilated form of com "with, together" (see con-) + tenere "to hold," from PIE root *ten- "to stretch."

From mid-14c. as "to have (something) as a constituent part;" from late 14c. as "have something inside, enclose." Related: Contained; containing; containable.