(historical) A period between circa 4000 to 3100 BC which saw the emergence of urban life in Mesopotamia and the Sumerian civilization.

(historical) The Uruk period.

(law enforcement) A patrol conducted by law enforcement to monitor or secure an area. / A general observation of an area conducted to ensure safety and security.

plural of perimeter check

(UK, television) A period of time on a Saturday during which football matches may not be broadcast (so as to avoid reduced attendance in person at other football matches that are not being televised).

(grammar) The part of a syntactic tree above the inflectional phrase(s) (expressing tense, aspect, and/or mood), where topic, focus, illocutionary force, etc. are expressed.

plural of periodic acid

plural of period drama

plural of non-periodic comet

Alternative spelling of quasiperiodic