Extra-

Part of speech: noun (n.)

A Latin preposition, denoting beyond, outside of; -- often used in composition as a prefix signifying outside of, beyond, besides, or in addition to what is denoted by the word to which it is prefixed.

Part of speech: noun (n.)

Something in addition to what is due, expected, or customary; something in addition to the regular charge or compensation, or for which an additional charge is made; as, at European hotels lights are extras. [Colloq.]

Part of speech: adjective (a.)

Beyond what is due, usual, expected, or necessary; additional; supernumerary; also, extraordinarily good; superior; as, extra work; extra pay. "By working extra hours." H. Spencer.