multiset

About 0.07 uses per million words.

Meaning

1. noun A generalized type of set in which multiple occurrences of an element are permitted.

   Two words are anagrams if they are made up of the same multiset of letters.

Similar words

multisubset submultiset metaset tomset sets set operation subset collection poset item set

Often followed by

of is rewriting and over union m ordering with