singleton

A playing card that is the only one of its suit in a hand, especially at bridge.

A hand containing only one card of a certain suit.

A single object, especially one of a group.

A class that may not be instantiated more than once, i.e. that implements the singleton design pattern.

单例

A set with exactly one element.

A child or animal that is born singly, not as a twin or other multiple birth.

A person without a romantic partner.

A person without a dissociative identity.

A single consonant, as opposed to a geminated consonant.

Synonym of blot.

A class offered only once within a school year.

Of a class offered only once within a school year.