1550s, "one who folds;" 1903, "folding cover for loose papers" (earlier as "a fold-up document," often a railway timetable or map); agent noun from fold (v.).
Entries linking to folder
fold v.
Old English faldan (Mercian), fealdan (West Saxon), transitive, "to bend (cloth) back over itself, wrap up, furl," VII strong verb (past tense feold, past participle fealden), from Proto-Germanic *falthan, *faldan (source also of Middle Dutch vouden, Dutch vouwen, Old Norse falda, Middle Low German volden, Old High German faldan, German falten, Gothic falþan), from PIE *pol-to-, suffixed form of root *pel- (2) "to fold."
Of the arms, from late Old English. Intransitive sense "become doubled upon itself" is from c. 1300 (of the body); earlier "give way, fail" (mid-13c.). Sense of "to yield to pressure" is from late 14c. The weak conjugation developed from 15c. Related: Folded; folding.
billfold n.
"folding pocketbook for paper money," 1879, from bill (n.1) + fold, here perhaps short for folder.