a group of things of the same kind that belong together and are so used

(mathematics) an abstract collection of numbers or symbols

several exercises intended to be done in series

representation consisting of the scenery and other properties used to identify the location of a dramatic production

an unofficial association of people or groups

a relatively permanent inclination to react in a particular way

the act of putting something in position

a unit of play in tennis or squash

the process of becoming hard or solid by cooling or drying or crystallization

the descent of a heavenly body below the horizon

(psychology) being temporarily ready to respond in a particular way

any electronic equipment that receives or transmits radio or tv signals