num

• (number theory) The first positive number in the set of natural numbers.
• (set theory) The cardinality of the smallest nonempty set.
• (mathematics) The ordinality of an element which has no predecessor, usually called first or number one.

pron

• (impersonal pronoun, indefinite) One thing (among a group of others); one member of a group.
  "Any one of the boys."
• (impersonal pronoun, sometimes with "the") The first mentioned of two things or people, as opposed to the other.
  "She offered him an apple and an orange; he took (the) one and left the other."
• (indefinite personal pronoun) Any person (applying to people in general).
  "One’s guilt may trouble one, but it is best not to let oneself be troubled by things which cannot be changed.  One shouldn’t be too quick to judge."
• (pronoun) Any person, entity or thing.
  ""driver", noun: one who drives."

noun

• (by ellipsis) Used to briefly refer to a noun phrase understood by context
  "I need some ones to make change."
• (by ellipsis) Used to briefly refer to a noun phrase understood by context
  "It was already one in the morning; the rain pattered dismally against the panes, and my candle was nearly burnt out, when, by the glimmer of the half-extinguished light, I saw the dull yellow eye of the creature open; it breathed hard, and a convulsive motion agitated its limbs."
• (by ellipsis) Used to briefly refer to a noun phrase understood by context
• (by ellipsis) Used to briefly refer to a noun phrase understood by context
  "Did you hear the one about the agnostic dyslexic insomniac?"

verb

• (transitive) To cause to become one; to gather into a single whole; to unite.
  "The question, of course, evokes discernment, not dogma, but we should note that the "unknowing" involves intellectual knowledge, whereas the problematic of being "oned" involves experiential knowledge."