This is the 8099th most frequent Japanese word.
密教
Esoteric Buddhism.
密教 refers to Esoteric Buddhism—a significant tradition within Buddhist teachings.
密教は仏教の一つの重要な宗派です。
Esoteric Buddhism is an important school of Buddhism.
密教 here denotes the tradition of Esoteric Buddhism, emphasizing its historical practices.
日本では密教の儀式が古くから行われています。
In Japan, esoteric Buddhist rituals have been performed since ancient times.
密教 in this sentence refers to the philosophical and doctrinal framework of Esoteric Buddhism.