(art) A series of presentations and/or performances, discussions or similar events that happen on a fixed day every month (or similar; for example "every second Sunday of a month"). Used mainly by cultural and artistic organizations.

(Christianity) an annual celebration that is held on the same calendar date every year, such as Christmas (December 25)

(computing) A fractional-number representation with a fixed number of digits after the decimal point. Compare floating point and integer.

(computing) Pertaining to fixed point representations or operations.

(chemistry, now historical) Carbon dioxide; carbonic acid.

simple past tense and past participle of fix up

(astronomy) Any star that is so distant that its movement, relative to others, is not perceptible; in practice, any star except the sun

(computing) Being or using an internal number representation with a fixed number of decimal places (as opposed to floating-point).

Only lasting for an pre-arranged time.

Alternative spelling of idée fixe