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Rehabilitation: the action or process of making possible a continuing or compatible contemporary use of a historic place or an individual component, through repair, alterations, and/or additions, while protecting its heritage value. Rehabilitation can include replacing missing historic features. The replacement may be an accurate replica of the missing feature, or it may be a new design that is compatible with the style, era, and character of the historic place.

Preservation: the action or process of protecting, maintaining, and/or stabilizing the existing materials, form, and integrity of a historic place or of an individual component, while protecting its heritage value. Preservation can include both short-term and interim measures to protect or stabilize the place, as well as long-term actions to retard deterioration or prevent damage so that the place can be kept serviceable through routine maintenance and minimal repair, rather than extensive replacement and new construction.

Conservation: all actions or processes that are aimed at safeguarding the character-defining elements of a cultural resource so as to retain its heritage value and extend its physical life. This may involve "Preservation," "Rehabilitation," "Restoration," or a combination of these actions or processes. Reconstruction or reconstitution of a disappeared cultural resource is not considered conservation and is therefore not addressed in this document.

Restoration: the action or process of accurately revealing, recovering or representing the state of a historic place or of an individual component, as it appeared at a particular period in its history, while protecting its heritage value. Restoration includes the removal of features from other periods in its history and the reconstruction of missing features from the restoration period. Restoration must be based on clear evidence and detailed knowledge of the earlier forms and materials being recovered.

Parks Canada Standards and Guidelines for the Conservation of Historic Places in Canada: http://www.pc.gc.ca/docs/pc/guide/nldclpc-sgchpc/page1/page1b.aspx