(1):

(n.) That which preserves from injury.

(2):

(n.) A place for preserving anything from loss, decay, waste, or injury; particulary, a greenhouse for preserving exotic or tender plants.

(3):

(n.) A public place of instruction, designed to preserve and perfect the knowledge of some branch of science or art, esp. music.

(4):

(a.) Having the quality of preserving from loss, decay, or injury.