1) Polygamy 
Polygyny (iː; from Neo-Greek πολυγυνία from πολύ- poly- `many`, and γυνή gyne `woman or wife`) is a form of plural marriage in which a man is allowed more than one wife (i.e. it is a narrow form of polygamy, and distinguished from other forms of polygamy such as polyandry). In modern countries that permit polygamy, polygyny i...
• (n.) The state or practice of having several wives at the same time; marriage to several wives.
a form of marriage joining one male with two or more females
(from the article `reproductive behaviour`) In a number of polygynous (mating of one male with more than one female) and promiscuous species, adult females outnumber adult males, sometimes by a ...marriage of a man to two or more women at the same time. See polygamy.[17 related articles]
When a male animal mates with more than one female.
A form of marriage in which a man may have more than one wife at the same time.
Marriage between one man and two or more women. Polygyny is practised in nearly 70% of all societies. In Islamic countries a man may have up to four wives by Koranic law. The Mormons...
<botany> Describes the condition of a plant whose flowers have several pistils or styles. ... <psychology> Describes the practice of a man having several wives at once. ... (14 Oct 1997) ... 
(pә-lij´ĭ-ne) a form of marriage in which one man has two or more wives at the same time.
The condition of a male having more than one mate in a breeding cycle.
Mating of one male animal with several females.
Po·lyg'y·ny noun [ Poly- + Greek ... woman, wife.] The state or practice of having several wives at the same time; marriage to several wives. H. Spenser. 
One male mates with several females. Also see Polyandry and Polygamy.
polygyny, polygynous The marriage of a man to more than two women at the same time.polygyny 1. The practice of having many female mates. 2. The mating of a single male with several females. 3. The presence of many queens within a single colony of social insects.
Mating system in which one male mates with several females within the same breeding season. Polyandrous species include Spotted Sandpipers, most jacanas, and certain phalaropes.
A common form of polygamy where one male mates with several females.
noun having more than one wife at a time
Breeding system in which one male mates with more than one female. Females usually undertake all parental care.
The mating system in which one male mates with more than one female.
A mating system in which a single male mates with many females.