1. Noun
A unit; a single point or spot on a card or die; the card or die so marked; as, the ace of diamonds.
2. Noun
Hence: A very small quantity or degree; a particle; an atom; a jot.
3. Noun
the smallest whole number or a numeral representing this number; "he has the one but will need a two and three to go with it"; "they had lunch at one"
Vocabulary classified under Mathematics
4. Noun
proteolytic enzyme that converts angiotensin I into angiotensin II
Vocabulary classified under Biology
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