term:

Tack

tack vt

: to combine (a use, possession, or period of time) with that of another esp. in order to satisfy the statutory time period for acquiring title to or a prescriptive easement in the property of a third party [successive adverse users in privity with prior adverse users can successive adverse possessions of land "Hall v. Kerlee, 461 S.E.2d 911 (1995)"]

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.