late 14c., from Old French total (14c.), from Medieval Latin totalis "entire, total" (as in summa totalis "sum total"), from Latin totus "all, all at once, the whole, entire, altogether," a word of unknown origin. Total war is attested from 1937 (William Shirer), in reference to a concept developed in Germany.
common adverbial suffix, forming from adjectives adverbs signifying "in a manner denoted by" the adjective, Middle English, from Old English -lice, from Proto-Germanic *-liko- (cognates: Old Frisian -like, Old Saxon -liko, Dutch -lijk, Old High German -licho, German -lich, Old Norse -liga, Gothic -leiko); see -ly (1). Cognate with lich, and identical with like (adj.).
Weekley notes as "curious" that Germanic uses a word essentially meaning "body" for the adverbial formation, while Romanic uses one meaning "mind" (as in French constamment from Latin constanti mente). The modern English form emerged in late Middle English, probably from influence of Old Norse -liga.
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Definitions of totally from WordNet
to a complete degree or to the full or entire extent (`whole' is often used informally for `wholly');