extraordinary; remarkable; exceptional: a singular success.
2.
unusual or strange; odd; different: singular behavior.
3.
being the only one of its kind; distinctive; unique: a singular example.
4.
separate; individual.
5.
Grammar. noting or pertaining to a member of the category of number found in many languages that indicates that a word form has one referent or denotes one person, place, thing, or instance, as English boy and thing, which are singular nouns, or goes, a singular form of the verb go.Compare dual(def. 4), plural(def. 4).
6.
Logic.
a.
of or pertaining to something individual, specific, or not general.
b.
(of a proposition) containing no quantifiers, as “Socrates was mortal.”
7.
Mathematics.
a.
of or pertaining to a linear transformation from a vector space to itself that is not one-to-one.
b.
of or pertaining to a matrix having a determinant equal to zero.
[sing-gyuh-ler] 
gyə