Also found in: Dictionary, Financial.
PRIMER SEISIN, Eng. law. The right which the king had, when any of his tenants died seised of a knight's fee, to receive of the heir, provided he were of fall age, one whole year's profits of the lands, if they were in immediate possession; and half a year's profits, if the lands were in reversion, expectant on an estate for life. 2 Bl. Com. 66.