3660 omnuo {om-noo'-o}
a prolonged form of a primary but obsolete omo, for which another
prolonged form (omoo {om-o'-o}) is used in certain tenses;
TDNT - 5:176,683; v
AV - swear 27; 27
1) to swear
2) to affirm, promise, threaten, with an oath
3) in swearing to call a person or thing as witness, to invoke, swear by