term:

Covenant

covenant n

1 : an official agreement or compact [an international on human rights]
2 a : a contract in its entirety or a promise within a contract for the performance or nonperformance of a particular act [a not to sue]
;specif
: a promise relating to the transfer, possession, or ownership of real property see also covenant not to compete, restrictive covenant
b : a warranty in a deed assuring the grantee esp. against defects in title [a for quiet enjoyment] see also run
3 : a common-law action to recover damages for breach of a contract under seal compare assumpsit, debt
covenant vb