Adiaphoron (/ædɪˈæfərɒn, ædiˈæfərɒn/; plural: adiaphora; from the Greek ἀδιάφορα (pl. of ἀδιάφορον), meaning “not different or differentiable”)

Aristotle uses “adiaphora” to mean “undifferentiated by a logical differentia.”

In Christianity, adiaphora are concerns not believed as necessary to faith, none the less these concerns as permitted for Christians in the religion. What is exactly determined to be adiaphora is contingent on the specific concern in mind.