(physics, used mostly in plural) One vessel in a system of containers filled with a homogeneous fluid, connected at the base and subjected to the same atmospheric pressure.

plural of intelligence community

(botany, ecology) a group of plants of different species which coexist in a habitat under certain conditions, and that may be mutually dependent on each other.

plural of plant community

plural of community cat

An autonomous community of Spain. Capital: Madrid.

(epidemiology) The transmission of an illness through unknown untraced members of the greater community, indicative of a reservoir of anonymous infected individuals.

plural of spirit communication

(parapsychology) The practice of living humans purportedly speaking or otherwise communicating with spirits of deceased individuals, as through seances, mediums, etc.

A policeman who maintains a regular presence in a particular community, forging relationships with people who live in the community and using those to prevent crime and de-escalate conflict.