also: でんきょう
noun
Primarily used for Buddhist missionary activities and spreading teachings; can also refer to Christian missionary work in modern contexts.
彼は仏教の伝教のために海外へ渡った。
He went abroad for Buddhist missionary work.
伝教の歴史を学ぶ。
Study the history of missionary work.
Compound of 伝 (transmit) and 教 (teaching). The exact historical derivation is uncertain, but the term has been used in Buddhist contexts for centuries.