Definition of "nat"

nat¹

/nɑːt/

noun
plural nats
1. A spirit in Burmese mythology, whose cult is followed alongside Buddhism.
  Quotations
  They greatly dread evil "Nats" or spirits, to whom they attribute every possible misfortune or illness.
  1936, Rollo Ahmed, The Black Art, London: Long, page 175

nat²

adverb
not comparable
1. (obsolete) Not.
  Quotations
  And he a pistle rowned in her eare, / Nat what I want, for I ne came nat there.
  1614, William Browne, The Shepheard's Pipe

nat³

noun
plural nats
1. A logarithmic unit of information or entropy, based on natural logarithms.

nat⁴

noun
plural nats
1. (colloquial, US) Clipping of natatorium.