(idiomatic, euphemistic) To satisfy a bodily urge to urinate or defecate.

A hypothetical alternative to the anthropic principle that attempts to explain the complexity of the universe

(immunology) Any cell that expresses cell surface receptors that deliver signals to either activate or inhibit a response as part of the innate immune system.

(law) Any of various sexual deviations that, at one time or another, have been considered to be so unnatural as to be illegal.

(Canada, politics, slang) The Liberal Party of Canada (LPC).

Timing sexual intercourse to avoid the time of ovulation (if pregnancy is not wanted) or to fall within that time (if pregnancy is desired).

Natural gas that has been cooled and compressed to liquid form for transport and storage.

(computing) A user interface for a computer that is effectively invisible, or becomes invisible to its users with successive learned interactions.

plural of natural user interface

A field of computer science and linguistics concerned with the interactions between computers and human (natural) languages, especially computational analysis and processing of large amounts of natural language data.