any number of entities (members) considered as a unit | a group of many things in the air or on the ground |
a set that is closed, associative, has an identity element and every element has an inverse | a visible mass of water or ice particles suspended at a considerable altitude |
(chemistry) two or more atoms bound together as a single unit and forming part of a molecule | any collection of particles (e.g., smoke or dust) or gases that is visible |
| suspicion affecting your reputation |
| out of touch with reality |
| a cause of worry or gloom or trouble |