adjective. Possible to estimate, measure, or perceive: synonym: perceptible.

Capable of being appreciated, estimated, or perceived; neither too small nor too great to be capable of estimation or recognition; perceptible.

adjective. Capable of being appreciated or estimated; large enough to be estimated; perceptible.

adjective. Capable of being appreciated or estimated; large enough to be estimated; perceptible; considerable.

adjective. enough to be estimated or measured

"Another prediction of such a surfing model is that even a very small number of events of interbreeding can result in appreciable allele frequencies of Neandertal alleles in the present-day populations."

considerable  

approximate  considerable  cumulative  detectable  discernible  

apparent  appraisable  apprehensible  ascertainable  assessable