劫 - threat, long ages

the kalpa of existence (the second aeon of the universe)

the kalpa of formation (the first aeon of the universe)

the four kalpa (formation, existence, destruction, nothingness)

eternity; perpetuity

kalpa (eon, aeon)

the kalpa of nothingness (the final aeon of the universe)

time immemorial

incomprehensibly long time; infinity

Jinkōki (1627 Japanese mathematics text by Yoshida Kōyū)

pillage; plunder

eternity

eternal recurrence; eternal return