Synonyms for one

modified

1. Single

   individual, peculiar, especial, specific, separate, single, lone, singular, odd, one and only, solitary, singular, precise, definite, sole, uncommon; see also different 1, 2, special 1, unique 1, unusual 2.

2. Unified

   united, bound, entire, complete; see unified, united, whole 1, 2.

   Antonyms common*, several, imprecise.

noun

1. A single item

   unit, 1, whole, person, thing, identity, ace, integer, item, example, digit, singleness, individual, individuality, individuation.

   Antonyms plural, many*, several.

2. The quality of being united

   unitedness, totality, entirety; see unity 1.

all one

at one