Although most acts have a definitions section, usually at the beginning of the act, it is logistically impossible for an act to define all the words and terms it uses. If you are trying to find the meaning of a term that isn’t defined in an act, check that jurisdiction’s Interpretation Act. Definitions of terms that are used by multiple acts are quite often found in this act. For example, terms defined in the federal Interpretation Act include “herein”, “holiday” and “oath”. You will find Interpretation Acts in federal and all provincial legislation.
Interpretation acts are also useful when it comes to statutory interpretation. For example section 11 of the federal Interpretation Act distinguishes between the meaning of “shall” and the meaning of “may”.