1) Interest 2) Stake 
• (a.) Of or pertaining to a reversion; involving a reversion; to be enjoyed in succession, or after the termination of a particular estate; as, a reversionary interest or right. • (n.) That which is to be received in reversion.
Re·ver'sion·a·ry adjective (Law) Of or pertaining to a reversion; involving a reversion; to be enjoyed in succession, or after the termination of a particular estate; as, a reversionary interest or right. 
[adj] - of or relating to or involving a reversion (especially a legal reversion)
adjective of or relating to or involving a reversion (especially a legal reversion); `reversionary annuity`; `reversionary interest`