almost all

almost all

1. (mathematics) All, except for a negligible set, i.e. finite, countable or of measure zero.

   Alternative form: a.a.

   Antonym: almost no

   Rational numbers are a countable set, so almost all numbers are irrational.

2. In non-mathematical use, see almost, all.

   We've eaten almost all of the cake.

• almost everywhere, almost nowhere
• almost certain, almost sure

• Thesaurus:quantifier