The word singular may refer to one of several concepts.

The singular is a grammatical number denoting a unit quantity (as opposed to the plural and other forms)
A singular matrix is one that is not invertible.
A measure (mathematics) or probability distribution is called singular if its support has zero Lebesgue measure. More generally, one may speak of an object "singular with respect to a measure μ", and that means that μ replaces the Lebesgue measure above.
An infinite cardinal number is called singular if it is not a regular cardinal

Also,

In common English, singular means 'unique'.
SINGULAR is a computer algebra system.
A mathematical singularity is an object in mathematics. There is also a corresponding physical notion of a gravitational singularity and, more loosely, a technological singularity.

Singular is also a collective noun for a group of boars, possibly deriving from the French 'sanglier'(boar).

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Singular

a noun which is a person place or thing can be either singular or plural