intercolumniation
Concise Oxford English Dictionary © 2008 Oxford University Press:
intercolumniation /ˌɪntəkəlʌmnɪˈeɪʃ(ə)n/
▶noun Architecture the distance between adjacent columns.
– derivatives
intercolumnar adjective.
intercolumnar adjective.
'intercolumniation' also found in these Oxford entries:

