What is "adiaphora"

a. (rfv-sense) (alternative spelling of adiaphorous English) n. (plural of adiaphoron English)

Adiaphoron (plural: adiaphora from the Greek ἀδιάφορα "indifferent things") is a concept of Stoic philosophy that indicates things outside of moral law—that is, actions that morality neither mandates nor forbids.

In Pyrrhonism, "adiaphora" indicates things which cannot be logically differentiated.

In Christianity, adiaphora are matters not regarded as essential to faith, but nevertheless as permissible for Christians or allowed in church. What is specifically considered adiaphora depends on the specific theology in view.