adiaphoron

noun
ad·​i·​aph·​o·​ron | \ˌa-dē-ˈa-fə-ˌrän, -rən\
plural adiaphora\ˌa-​dē-​ˈa-​fə-​rə \

Definition of adiaphoron 

1 Stoic philosophy : a matter having no moral merit or demerit

2 : a religious ceremonial or ritual observance that is held to be an affair of the individual conscience because it is neither forbidden nor enjoined by the scriptures

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First Known Use of adiaphoron

1538, in the meaning defined at sense 2

History and Etymology for adiaphoron

Greek, from neuter of adiaphoros indifferent, from a- a- entry 2 + diaphora difference, from diapherein to carry across, bear to the end, make a difference, from dia- + pherein to bear

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The first known use of adiaphoron was in 1538

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