Meaning

1. A set of items or amount of material procured, gathered or presented together.
2. A set of pitch classes used by a composer.
3. The activity of collecting.
4. A set of sets; used because such a thing is in general too large to comply with the formal definition of a set.
5. A gathering of money for charitable or other purposes, as by passing a contribution box for donations.
6. Debt collection.
7. (obsolete) The act of inferring or concluding from premises or observed facts; also, that which is inferred.
8. The jurisdiction of a collector of excise.
9. A set of college exams generally taken at the start of the term.
10. The quality of being collected; calm composure.