Origin: Latin suffix -ory
Obligatory has 3 different meanings across 1 category:
morally or legally constraining or binding
"attendance is obligatory"
"an obligatory contribution"
required by obligation or compulsion or convention
"he made all the obligatory apologies"
Imposing obligation, legally, morally, or otherwise; binding; mandatory.
"The new safety regulations made wearing a helmet obligatory for every rider on public transit bikes."