Meaning of maintenance of membership

main'tenance of mem'bership

Pronunciation: [key]
  1. an arrangement or agreement between an employer and a labor union by which employees who are members of the union at the time the agreement is made, or who subsequently join, must either remain members until the agreement expires, or be discharged.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.