Adiaphora
Adiaphora (Gr. "indifferent things"; German "Mitteldinge" ("middle matters")) refers to matters not regarded as essential to faith, and which might therefore be allowed in the church. In particular the Lutheran confessions of the sixteenth century speak of adiaphora as "church rites which are neither commanded nor forbidden in the Word of God." (Confessio Augustana (The Augsburg Confession), 1530).