Plaintiff B15a v Minister  HCA 24
If words of an Act are in the singular, they are presumed to include the plural (and vice versa) unless a contrary intention appears – see s 23 of the Acts Interpretation Act 19011.
In this High Court case, however, Kiefel J (at ) rejected the idea that ‘a parent’ should be read only in the plural (that is, as ‘both parents’). The singular/plural presumption cannot be used to exclude the form used in the Act. iTip 1 – use this presumption to broaden the scope of nouns in statutes, not to reduce them. iTip 2 – it will be a rare case where the presumption is denied due to contrary intention.
This case is from Episode 3 of interpretationNOW!
1 Pearce & Geddes (at [6.39]), Messenger Press FCAFC 77 (at ).