Etymology
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binder (n.)

Old English bindere "one who binds," agent noun from bind (v.). Of various objects or products that bind, from early 16c.

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Definitions of binder

binder (n.)
a machine that cuts grain and binds it in sheaves;
Synonyms: reaper binder
binder (n.)
something used to bind separate particles together or facilitate adhesion to a surface;
binder (n.)
holds loose papers or magazines;
Synonyms: ring-binder
binder (n.)
something used to tie or bind;
Synonyms: ligature
From wordnet.princeton.edu