To link together in a chain or series, like connecting links in a chain.
From Latin 'catena' meaning chain, plus the suffix '-ate' to form a verb. The word evolved in English to describe the action of joining things sequentially.
This word is used in computer science and chemistry to describe linking things together—when you 'concatenate' strings in programming, you're literally doing what this word means, chaining digital information end-to-end.
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