Etymology
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besides (prep.)

attested from c. 1200, common after c. 1400, from beside (q.v.) + adverbial genitive -s. Once sharing all the senses of beside, now properly limited to the adverbial sense "in addition to, otherwise."

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Definitions of besides

besides (adv.)
making an additional point; anyway; "I don't want to go to a restaurant; besides, we can't afford it";
Synonyms: in any case
besides (adv.)
in addition;
Synonyms: too / also / likewise / as well
From wordnet.princeton.edu