In polygamy, a wife of one's father who is not one's mother; that is, co-wife of one's mother.
In polygamy, the relationship between one co-wife and another, in respect to their children.
In a lesbian couple, the nonbirth mother (partner of the birth mother) of a child, especially one who takes an equal role in mothering the child.
A member of one's extended family; a relative.
The manner in which two things may be associated.
A set of ordered tuples.
A set of ordered tuples retrievable by a relational database; a table.
The act of intercourse.
Specifically, a set of ordered pairs; a binary relation.
The act of relating a story.
A statement of equality of two products of generators, used in the presentation of a group.
A subobject of a product of objects.