-ory

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Of, relating to, or characterized by: advisory.
2. n. A place or thing used for or connected with: crematory.

Century Dictionary and Cyclopedia

1. Bearing or containing ore: as, ory matters. Also spelled orey.
2. A termination of adjectives and nouns of Latin origin, as in auditory, preparatory, etc.

GNU Webster's 1913

1. n. An adjective suffix meaning of or pertaining to, serving for; as in auditory, pertaining to or serving for hearing; prohibitory, amendatory, etc.
2. n. A noun suffix denoting that which pertains to, or serves for; as in ambulatory, that which serves for walking; consistory, factory, etc.