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The words to and too have rather different meanings but from what little information I can gather (from their Dictionary.com references) they seem to potentially be from the same old-English root.

If these two words are related in origin, how and why was the original word divided into two different spellings?

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up vote 12 down vote accepted

Already in Old English the Old English preposition 'to, into' (and other senses) gave rise to an adverb 'besides, also; moreover'. In normal speech the preposition was generally unstressed, and as a result the vowel tended to be reduced from [ō] to [ɔ] or perhaps even to [ɑ], since the spelling ta actually occurs. Similarly, in present-day English the preposition to in connected speech is usually unstressed and reduced: ‘I went t[ə] the store’, not ‘I went t[ū] the store’. The Old English adverb, on the other hand, was likely to receive stress in connected discourse and therefore to retain the full vowel: [tō].

This situation continued into Middle English. However, during the later Middle English (and extending into the Early Modern English) period the pronunciation of English long vowels changed dramatically. These changes are collectively known as the (English) Great Vowel Shift (GVS). (See these pages for more information.) In particular, [ō] shifted to [ū], the vowel in present-day English too. At this point the preposition was usually pronounced something like [tə] in connected speech, while the adverb was [tū], pretty much as in present-day English. This greater disconnect between the two pronunciations tended to obscure the historical relationship between the preposition and the adverb.

Middle English spelling was of course not standardized, but vowel length was often indicated by doubling. As a result, words with the vowel [ō] were often spelled with oo, though this seems not generally to have occurred with the adverb in question. After the GVS, words spelled with this oo were pronounced with [ū], and as spelling became increasingly standardized, oo was more and more associated with the vowel [ū]. Since the adverb had for some time been clearly distinguished from the preposition in pronunciation as well as in sense, there was no real reason to maintain the historical connection, and too, a spelling that represented the actual pronunciation of the adverb, gradually displaced the older to spelling.

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+1 Excellent answer. –  Cerberus Aug 23 '11 at 3:34
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They are indeed related, through English's Germanic roots. 'Too' came to us around 500 years ago. Etymonline says:

too (adv.) "in addition, in excess," late O.E., stressed variant of O.E. prep. to "in the direction of, furthermore" (see to). The spelling with -oo is first recorded 1590. Use after a verb, for emphasis (e.g. did, too!) is attested from 1914. Ger. zu unites the senses of Eng. to and too. Slang too-too "excessive in social elegance" first recorded 1881. Too much "excellent" first recorded 1937 in jazz slang.

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+1 each for Q & A, for telling me something I never would have expected! –  FumbleFingers Aug 22 '11 at 20:52
    
@Mark -- What source are you using? –  simchona Aug 22 '11 at 21:23
    
@simchona: He’s quoting etymonline. –  Brian M. Scott Aug 22 '11 at 21:45
    
Sorry for not giving a citation –  Mark T Aug 23 '11 at 2:52
    
Is this saying that "too much" didn't appear in the English language until 1937, or just the meaning "excellent"? –  Andrew Vit Sep 29 '11 at 21:43
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