Dictionary
in•ter•ca•late
Pronunciation: (in-tûr'ku-lāt"), [key]—
v.t., -lat•ed, -lat•ing.
1. to interpolate; interpose.
2. to insert (an extra day, month, etc.) in the calendar.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.