in·ter·co·lum·ni·a·tion 
(ĭn′tər-kə-lŭm′nē-āshən)
(ĭn′tər-kə-lŭm′nē-āshən)n.
1. The open spaces between the columns in a colonnade.
2. The system by which the columns in a colonnade are spaced.
- extraneous
- extraneously
- extraneousness
- extranet
- extranuclear
- extraocular muscle
- extraordinaire
- extraordinarily
- extraordinary
- extrapolate
- extrapolation
- extrapolative
- extrapolator
- extrapyramidal
- extrasensory
- extrasensory perception
- extrasolar
- extrasystole
- extrasystolic
- extraterrestrial
- extraterritorial
- extraterritoriality
- extraterritorially
- extratropical
- extrauterine