All 3 Uses

polygamy
in
The Handmaid's Tale
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Gilead outlawed the first two as irreligious but legitimized and enforced the third, which was considered to have Biblical precedents; they thus replaced the serial polygamy common in the pre-Gilead period with the older form of simultaneous polygamy practiced both in early Old Testament times and in the former state of Utah in the nineteenth century.†
Chpt 47
Gilead outlawed the first two as irreligious but legitimized and enforced the third, which was considered to have Biblical precedents; they thus replaced the serial polygamy common in the pre-Gilead period with the older form of simultaneous polygamy practiced both in early Old Testament times and in the former state of Utah in the nineteenth century.†
Chpt 47
As we know, the sociobiological theory of natural polygamy was used as a scientific justification for some of the odder practices of the regime, just as Darwinism was used by earlier ideologies.†
Chpt 47 *

Definitions:

(1) (polygamy)
the practice of being married to more than one person at the same time
(2) (meaning too rare to warrant focus)