too

1. (focus) Likewise.Examples: "The preposterous altruism too![…]Resist not evil. It is an insane immolation of self—as bad intrinsically as fakirs stabbing themselves or anchorites warping their spines in caves scarcely large enough for a fair-sized dog."; "The use of algorithms in policing is one example of their increasing influence on our lives. And, as their ubiquity spreads, so too does the debate around whether we should allow ourselves to become so reliant on them – and who, if anyone, is policing their use."focusnot-comparable

2. (conjunctive) Also, in addition marks a statement as equally valid as the preceding one.Examples: "There has been a cutback in federal subsidies. Rates have been increasing too."; "He's always willing to help. He, too, is generous with his time."; "It is important to remember, too, that she is generous with his time. Sometimes, too, she does ask for the odd favor."Synonyms: as well, additionally, ekeconjunctivenot-comparable

3. (degree) To an excessive degree, more than enough indicates that the degree of a quality is more than what is needed or wanted.Examples: "Near-synonyms: extremely, unnecessarily, all too"; "I'm still much too young to drive, and my grandpa is already far too old."; "This water is too polluted for us to drink (it)."Synonyms: unduly, over, over-, overly, excessivelynot-comparable

4. (degree, colloquial) To a high degree, very.Examples: "She doesn't talk too much.  I'm not too sure about this."Synonyms: so, all thatcolloquialnot-comparable

5. (emphatic, colloquial, childish) Used to contradict a negative assertion with present and simple past forms of be, do, and auxiliary verbsExamples: "You're not old enough yet. ― I am too!"; "You can't jump that fence. ― Can too jump it!"; "We haven't been mean to you. ― Have too, plenty of times"Synonyms: sochildishcolloquialemphaticnot-comparable

6. (archaic, colloquial) Used for emphasis, without reference to any previous statement.Examples: "The trooper thanks his informant and rides slowly on, looking about him. […] He comes to a gateway in the brick wall, looks in, and sees a great perplexity of iron lying about in every stage and in a vast variety of shapes— […] "This is a place to make a man's head ache too!" says the trooper, looking about him for a counting-house."archaiccolloquialnot-comparable