(mathematics) an interval in the real number line which does not contain its supremum and infimum. If specified by a pair of real numbers, then it consists of all the points on the real line whose values lie strictly between those two real numbers.

plural of open set

(topology) A cover whose members are all open sets.

plural of pipe-opener

plural of letter opener

Disaster Management Open Platform for Emergency Networks. A system which provides interoperability interfaces for sharing of emergency-related information to vetted emergency management agencies.

plural of open relationship

A romantic and/or sexual relationship in which the people involved are permitted or tolerated to be available to have additional simultaneous romantic and/or sexual relationships.

A configuration of a mouth wherein the front top teeth are separated vertically from the front bottom teeth even while the back top teeth are resting directly upon the back bottom teeth.

plural of open bite