singular
US /ˈsɪŋ.ɡjə.lɚ/
UK /ˈsɪŋ.ɡjə.lɚ/

1.
of or relating to a single person or thing, as opposed to more than one
:
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The word 'cat' is a singular noun.
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He has a singular focus on his career.
2.
exceptionally good or great; remarkable
:
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She showed singular courage in the face of danger.
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His performance was of singular brilliance.
1.
the singular form of a word
:
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The singular of 'children' is 'child'.
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In English, most nouns have a singular and a plural form.