Pronunciation: (im-pûr'fur-it, -fu-rāt"), [key]
1. Also,im•per'fo•rat"ed.not perforate; having no perforation.
2. Philately.(of a number of stamps joined together) lacking the perforations usually separating individual stamps.
an imperforate stamp.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.