Webster's Revised Unabridged Dictionary · 1913

Jointure

Jointure , noun

[French jointure a joint, orig., a joining, Latin junctura, from jungere to join. See Join, and compare Juncture.]

1.
A joining; a joint. [Obsolete]
2.
(Law) An estate settled on a wife, which she is to enjoy after husband's decease, for her own life at least, in satisfaction of dower.
The jointure that your king must make, Which with her dowry shall be counterpoised. — Shakespeare

Jointure , transitive verb

To settle a jointure upon.