too

[too]
adverb
1.
in addition; also; furthermore; moreover: young, clever, and rich too.
2.
to an excessive extent or degree; beyond what is desirable, fitting, or right: too sick to travel.
3.
more, as specified, than should be: too near the fire.
4.
(used as an affirmative to contradict a negative statement): I am too!
5.
extremely; very: She wasn't too pleased with his behavior.
Idioms
6.
only too. only ( def 10 ).

Origin:
before 900; Middle English to, Old English, stressed variant of to (adv.); spelling too since the 16th century

to, too, two.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
too (tuː)
 
adv
1.  as well; in addition; also: can I come too?
2.  in or to an excessive degree; more than a fitting or desirable amount: I have too many things to do
3.  extremely: you're too kind
4.  informal (US), (Canadian) indeed: used to reinforce a command: you will too do it!
5.  (Brit), (Austral), (NZ) too right! certainly; indeed
 

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

too
"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.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Idioms & Phrases

too

In addition to the idioms beginning with too, also see carry too far; (too) close to home; eat one's cake and have it, too; go too far; irons in the fire, too many; life is too short; none too; not (too) bad; only too; speak too soon; spread oneself too thin; take on (too much);.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Others have suggested that the hosts either can't recognize foreign eggs or are
  too small to remove them.
Nothing-yet-has been tested in humans, so don't get too excited.
With the invention of photography, it became the business of the photographer
  too.
Too often, such protests are going unheard among collectors.
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