(Hebrew ברית bĕriyth) An agreement, a promise.
"And God spake unto Noah, and to his sons with him, saying, 'And I, behold, I establish my covenant with you, and with your זרע zera` (semen) after you...'" - Gen 9:8-9
"The secret of the holy covenant is the letter י Iod (Yud)..." - Zohar