The antonym of 'plural' in Indonesian is 'tunggal,' which translates to 'singular' in English. 'Plural' refers to a form of a word indicating more than one, while 'tunggal' or 'singular' refers to a form indicating only one. In Indonesian grammar, the use of plural markers differs from English; often, repetition of a word indicates plurality (e.g., 'anak-anak' means 'children'). However, the antonym of the concept of plurality is 'tunggal'.