Meaning of “singular” - Learner’s Dictionary

singular

adjective uk us /ˈsɪŋɡjələr/
GRAMMAR

A2 The singular form of a word is used to talk about one person or thing. For example 'woman' is the singular form of 'women'.

SPECIAL formal

very special, or found only in one person or situation:

a landscape of singular beauty

(Definition of “singular adjective” from the Cambridge Learner’s Dictionary © Cambridge University Press)