verb (used with object), forgot or (Archaic) forgat; forgotten or forgot; forgetting.
to cease or fail to remember; be unable to recall: to forget someone's name.
to omit or neglect unintentionally: I forgot to shut the window before leaving.
to leave behind unintentionally; neglect to take: to forget one's keys.
to omit mentioning; leave unnoticed.
to fail to think of; take no note of.
to neglect willfully; disregard or slight.
verb (used without object), forgot or (Archaic) forgat; forgotten or forgot; forgetting.
to cease or omit to think of something.
forget oneself, to say or do something improper or unbefitting one's rank, position, or character.

before 900; for- + get; replacing Middle English foryeten, Old English forg(i)etan; cognate with Old Saxon fargetan, Old High German firgezzan

forgettable, adjective
forgetter, noun
unforgetting, adjective

Both forgot and forgotten are used as the past participle of forget: Many have already forgot (or forgotten) the hard times of the Depression. Only forgotten is used attributively: half-forgotten memories. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
forget (fəˈɡɛt)
vb , archaic, dialect -gets, -getting, -got, -gotten, -got
1.  (when tr, may take a clause as object or an infinitive) to fail to recall (someone or something once known); be unable to remember
2.  (tr; may take a clause as object or an infinitive) to neglect, usually as the result of an unintentional error
3.  (tr) to leave behind by mistake
4.  (tr) to disregard intentionally
5.  (when tr, may take a clause as object) to fail to mention
6.  forget oneself
 a.  to act in an improper manner
 b.  to be unselfish
 c.  to be deep in thought
7.  forget it! an exclamation of annoyed or forgiving dismissal of a matter or topic
[Old English forgietan; related to Old Frisian forgeta, Old Saxon fargetan, Old High German firgezzan]

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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Word Origin & History

O.E. forgytan, from for- "passing by, letting go" (cf. forbear, forgo) + gietan "to grasp" (see get). A common Gmc. construction (cf. O.S. fargetan, Du. vergeten, Ger. vergessen "to forget"). The literal sense would be "to lose (one's) grip on," but that is not recorded in any
Germanic language. Related: Forgetting; forgot; forgotten.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Still, there's no forgetting the major impacts that it has on native plants and
  animal habitat.
It can be exhausting knowing everyone's business, and she makes a point of
  forgetting everything after each reading.
People drink alcohol for the pleasure and the taste, sometimes forgetting its
  medicinal properties.
Those against the use of concrete in building construction are forgetting its
  primary advantage: fire resistance.
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