A lack of understanding as to the nature and effect of a marriage ceremony under s 23B(1)(d)(iii) of the Marriage Act 1961 (Cth) will only void a marriage if the lack of understanding means the party did not really consent to the marriage. The provision does not operate as a freestanding ground of invalidity divorced from the question of consent. A party who understood they were voluntarily committing to a lifelong union but was mistaken about the legal effectiveness of the ceremony has given 'real consent' and the marriage is not void.
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