Etymology
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Words related to to

till (prep.)
"until," Old English til (Northumbrian) "to," from Old Norse til "to, until," from Proto-Germanic *tilan (source also of Danish til, Old Frisian til "to, till," Gothic tils "convenient," German Ziel "limit, end, goal"). A common preposition in Scandinavian, serving in the place of English to, probably originally the accusative case of a noun now lost except for Icelandic tili "scope," the noun used to express aim, direction, purpose (as in aldrtili "death," literally "end of life"). Also compare German Ziel "end, limit, point aimed at, goal," and till (v.).
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de 

Latin adverb and preposition of separation in space, meaning "down from, off, away from," and figuratively "concerning, by reason of, according to;" from PIE demonstrative stem *de- (see to). Also a French preposition in phrases or proper names, from the Latin word.

hereto (adv.)
"to this" (place, action, etc.), late 12c., from here + to.
heretofore (adv.)
c. 1200, from here + obsolete Old English toforan "formerly, before now," from to (prep.) + foran (adv.) "in front," dative of for. Also in Middle English heretoforn.
hitherto (adv.)
c. 1200, from hither + to.
into (prep.)
Old English into "into, to, against, in," originally in to. It emerged in late Old English to do the work of the dative case inflections, then fading, that formerly distinguished, for instance, the notion of "in the house" from that of "into the house." Compare onto, unto. To be into (something) "be intensely involved in or devoted to" recorded by 1967 in American English youth slang.
lean-to (n.)
"building whose rafters lean against another building or wall," mid-15c., from lean (v.) + to (adv.). Compare penthouse. "An addition made to a house behind, or at the end of it, chiefly for domestic offices, of one story or more, lower than the main building, and the roof of it leaning against the wall of the house" [Bartlett].
onto (prep.)

"toward and upon; to and in connection with; to the top of," 1580s, on to, from on + to. It appeared much later than parallel into, unto. As a closed compound, onto (on analogy of into), it is recorded from 1715. "The word is regarded by purists as vulgar, and is avoided by careful writers" [Century Dictionary, 1895].

set-to (n.)
"bout, fight," 1743, originally pugilistic slang, from verbal phrase; see set (v.) + to.
tae 
a Scottish form of to.