Etymology
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dynamic (n.)

"energetic force; motive force," 1894, from dynamic (adj.). As "manner of interaction," by 1978.

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interplay (n.)
1838, from inter- "between" + play (n.). "Reciprocal play," thus "free interaction."
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interface (n.)
1874, "a plane surface regarded as the common boundary of two bodies," from inter- + face (n.). Modern use is perhaps a c. 1960 re-coinage; McLuhan used it in the sense "place of interaction between two systems" (1962) and the computer sense "apparatus to connect two devices" is from 1964. As a verb from 1967. Related: Interfaced; interfacing.
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