Definitions of Act, Certificate and Form clarify scope and cross-reference governing Act for undefined terms. Rule 2 defines key terms for the Companies (Compliance Certificate) Rules: Act denotes the governing Companies Act; Certificate refers to the certificate mentioned in the proviso to subsection (1) of section 383A; and Form is the form appended to the rules. It provides that words or expressions not defined in the rules bear the meanings assigned to them in the Act, establishing an interpretive cross reference to the Act for undefined terms.