A stamp cut in half which has been used to pay the postage at half the face value of the original stamp or during shortages of stamps. The bisect is collected on the original cover with the postmark or cancellation covering the cut to prove it is a true bisect.
A stamp cut or perforated into two parts, each half representing half the face value of the original stamp. Officially authorized bisects have often been used during temporary shortages of commonly used denominations. Unauthorized bisects appear frequently on mail from some countries in some periods. Bisects are usually collected on full cover with the stamp tied by a cancel. At times, some countries have permitted trisects or quadrisects.
A Bisect is a genuine postal item like an original envelope, a wrapper or a postcard (or a fragment) showing an affixed cut half of a regular issued stamp, over which one or more postal markings have been applied.