[1830–40; intra- + mundane]This word is first recorded in the period 1830–40. Other words that entered Englishat around the same time include: ante, isomerism, isometric, nationalism, stroboscopeintra- is a prefix meaning “within,” used in the formation of compound words. Other wordsthat use the affix intra- include: intradermal, intrados, intranuclear, intrapreneur, intrastate