Apostolate
Definition 1 of 2

Context
The term is often used in spiritual contexts.

Many religious organizations assign apostolates to their members.
Connotation
The word carries strong positive connotations of commitment and service.

Those involved in an apostolate often find it deeply fulfilling.
Scope
It can be applied beyond religion to secular missions.

In a broader sense, apostolate can refer to any dedicated outreach for a cause.
Compare with
apostlemissionvocationministrycall
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