Rating Newest Oldest. Best Answer: Compulsory means that it's required, you have to do it. Compulsory education means that kids below a certain age have to go to school, whether they want to or not. Compulsory military service means you get drafted, whether you want to be in the military or not. Usually, if you do not do something that is compulsory, you can be arrested and sent to prison or, in the case of a child, sent to juvenile detention.