Mesne assignment
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
If A. grant a lease of land to B., and B. assign his interest to C-, and C. in his turn assign his interest therein to D., in this case the assignments so made by B. and C. would be termed "mesne assignments;" that is, they would be assignments intervening between A.'s original grant ftnd the vesting of D. 's interest in the land under the last assignment.
Brown.