(1) A karmic cause developing or growing to the point at which it can bear fruit, which means produce its result. This is ripening in its definitional sense. (2) A karmic causal factor on a mental continuum exhausting and finishing its presence there as it produces its fruit.
Tibetan: སྨིན་པ། smin-pa
J. Hopkins: Ripen; mature; fructify; maturation; ripening; matured; ripened.