action

the effort of doing something, not just talking or thinking about it

Something done, often so as to accomplish a purpose.

Purposeful behavior.

Fast-paced activity.

(slang) Heavy betting activity.

Combat.

A charge or other process in a law court (also called lawsuit and actio).

A way of motion or functioning.

The way in which a mechanical device acts when used; especially a firearm.

The way in which cartridges are loaded, locked, and extracted from the mechanism.

(slang) Sexual intercourse.

A demonstration by activists.

The event or connected series of events, either real or imaginary, forming the subject of a play, poem, or other composition; the unfolding of the drama of events.

A process existing in or produced by nature (rather than by the intent of human beings).

A physical mechanism of a firearm or other device.

The mechanism, that is the set of moving mechanical parts, of a keyboard instrument, like a piano, which transfers the motion of the key to the sound-making device.

The opportunity to act during a betting round.

The distance separating the strings and the fingerboard on a string instrument.

The product of energy and time, especially the product of the Lagrangian and time.

A way in which each element of some algebraic structure transforms some other structure or set, in a way which respects the structure of the first. Formally, this may be seen as a morphism from the first structure into some structure of endomorphisms of the second; for example, a group action of a group G on a set S can be seen as a group homomorphism from G into the set of bijections on S (which form a group under function composition), while a module M over a ring R can be defined as an abelian group together with a ring homomorphism from R into the ring of group endomorphisms of M (which is also called the action of R on M).

The attitude or position of the several parts of the body as expressive of the sentiment or passion depicted.

spin put on the bowling ball.

A religious performance or solemn function, i.e. action sermon, a sacramental sermon in the Scots Presbyterian Church.

(no longer used) A share in the capital stock of a joint-stock company, or in the public funds.

To act on a request etc, in order to put it into effect.

(no longer used) To initiate a legal action against someone.

Demanding or signifying the start of something, usually a performance.