1590s, "act of fixing," perhaps from fix (v.) on model of mixture, or from an assumed Latin *fixitatem. Meaning "anything fixed or securely fastened" is from 1812, an alteration of fixure (c. 1600).
a bum who is a Central Park fixture
fixative
fixed
fixer
fixings
fixity
fixture
fizgig
fizz
fizzle
fizzy
fjord