marriage of two people from different races or different religions or different cultures; "the families of both partners in a mixed marriage often disapprove"
a plant having a life cycle that normally takes two seasons from germination to death to complete; flowering biennials usually bloom and fruit in the second season
having a life cycle lasting two seasons; "a biennial life cycle"; "parsnips and carrots are biennial plants often grown as annuals"
occurring every second year; "they met at biennial conventions"
an intricate knot tied by Gordius, the king of Phrygia, and cut by the sword of Alexander the Great after he heard that whoever undid it would become ruler of Asia
any very difficult problem; insoluble in its own terms
a formal agreement establishing an association or alliance between nations or other groups to achieve a particular aim
an organization of people (or countries) involved in a pact or treaty
a connection based on kinship or marriage or common interest; "the shifting alliances within a large family"; "their friendship constitutes a powerful bond between them"