extra-
Outside; beyond.
[Latin extra, outside.]
Extraordinary comes from the Latin phrase extra ordinem, outside the normal course of events; an extramural course of study derives from Latin extra muros, outside the walls; extravagant from Latin vagari, wander; extraneous from extraneus, external; something extramarital occurs outside marriage, especially a sexual relationship.
Technical terms derived from the same source include extrapolate (extra- plus the second part of interpolate), to infer or estimate by extending or projecting known information; extraterrestrial, of or from outside the earth or its atmosphere (or a hypothetical or fictional being from outer space, especially an intelligent one); extravehicular, relating to work performed outside a spacecraft; extravasation (Latin vas, vessel), the escape of fluids from the vessels that naturally contain them.
A number of words contain Latin ex- instead, for example extract and extradition; see ex-1. The opposite is intra-.
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