The definition of a ‘spouse’ differs according to each superannuation fund’s trust deed.  The trust deed is the document which governs the exercise of the superannuation trustees’ discretion.  Some trust deeds confirm that ‘spouse’ has the meaning given to it in section 10 of the Superannuation Industry (Supervision) Act 1993 (Cth) (SIS Act), but others do not. Section 10 of the SIS Act defines the “spouse” of a person as: