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not

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not/ˈnɑːt/adverb
not
/ˈnɑːt/
adverb
Learner's definition of NOT  
— used to form the negative of modal verbs (such as “should” and “could”) and auxiliary verbs (such as “do” and “have”)
   b  — used before a verb or clause to make it negative or give it an opposite meaning
— see also not to mention at 1mention
— used with a word or phrase to make it negative or give it an opposite meaning
— see also not a few at 1few
   b  — used with a negative word to make a positive statement
   c  informal + humorous  — used humorously at the end of a positive statement to show that you really meant the opposite
: less or fewer than
— used to refer to a possible situation, condition, etc., that is different from or opposite to another situation, condition, etc. — often used in the phrase or not
— used to give a negative answer to a question

as like as not

orlike as not
— see 6like

more often than not

: happening more than half the time

not a/one

: no thing or person

not that

— used to say that something said before is not important
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