any number of entities (members) considered as a unit | (mathematics) the sum of a finite or infinite sequence of expressions |
a set that is closed, associative, has an identity element and every element has an inverse | a periodical that appears at scheduled times |
(chemistry) two or more atoms bound together as a single unit and forming part of a molecule | a serialized set of programs |
| (sports) several contests played successively by the same teams |
| similar things placed in order or happening one after another |
| a group of postage stamps having a common theme or a group of coins or currency selected as a group for study or collection |
| (electronics) connection of components in such a manner that current flows first through one and then through the other |