‖Ex″tra– (?). [L., fr. exter. See Exterior.] 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.