Waiver The passing-by of an occasion to enforce a legal right, whereby the right to enforce the same is lost. It may be expressed or implied; expressed as a statement that a right is waived; implied, buy conduct indicating an intention to abandon the right. A common instance is where a landlord waives his right to put an end to a lease by accepting rent, which did not become due until after the breach of covenant (giving him the right to terminate the lease) became known to him.