adjective

1. being the only one of its kind; single; unique a singular specimen
2. exceptional; extraordinary; remarkable singular beauty
3. peculiar; strange; odd what a singular remark!
4. Archaic existing apart from others; separate; individual
5. Gram. designating or of the category of number that refers to only one person or thing
6. Logic of an individual or particular thing considered by itself

Etymology: ME singuler < OFr < L singularis < singulus, single

noun

1. Gram.
   1. the singular number
   2. the singular form of a word
   3. a word in singular form
2. Logic a thing considered apart from all others