union card

1. 1.

   a card certifying membership in a labor union

   Broadermembership card

Questions about union card

What does union card mean?

union card means "a card certifying membership in a labor union".

Is union card a common word?

union card is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.