| Metric system () See Metric, a. |
| System (n.) An assemblage of objects arranged in regular subordination, or after some distinct method, usually logical or scientific |
| System (n.) Hence, the whole scheme of created things regarded as forming one complete plan of whole |
| System (n.) Regular method or order |
| System (n.) The collection of staves which form a full score. See Score, n. |
| System (n.) An assemblage of parts or organs, either in animal or plant, essential to the performance of some particular function or functions which as a rule are of greater complexity than those manifested by a single organ |
| System (n.) One of the stellate or irregular clusters of intimately united zooids which are imbedded in, or scattered over, the surface of the common tissue of many compound ascidians. |
| Bertillon system a system or procedure for identifying persons |
| buddy system a cooperative practice of pairing two or more people together for mutual assistance or safety (especially in recreational swimming) |
| water vascular system system of fluid-filled tubes used by echinoderms in locomotion and feeding and respiration |
| air transportation system a transportation system for moving passengers or goods by air |
| alarm / warning device / alarm system a device that signals the occurrence of some undesirable event |
| audio system / sound system a system of electronic equipment for recording or reproducing sound |
| backup system a computer system for making backups |
| basic point defense missile system a shipboard missile system |
| brake system / brakes a braking device consisting of a combination of interacting parts that work to slow a motor vehicle |
| bulletin board system / bulletin board electronic bulletin board / bbs a computer that is running software that allows users to leave messages and access information of general interest |