1.
If an organization is ~ with another larger organization, it is officially connected with the larger organization or is a member of it. (FORMAL)
There are 73 unions ~ to the Trades Union Congress.
ADJ: v-link ADJ to/with n, ADJ n
2.
If a professional person, such as a lawyer or doctor, is ~ with an organization, they are officially connected with that organization or do some official work for it. (FORMAL)
He will remain ~ with the firm as a special associate director.
...our ~ members.
ADJ: v-link ADJ with/to n, ADJ n