1) Considerable 2) French word used in English 1) Considerable 2) Noticeable 
• (a.) Capable of being appreciated or estimated; large enough to be estimated; perceptible; as, an appreciable quantity.
Ap·pre'ci·a·ble adjective [ Confer French appréciable .] Capable of being appreciated or estimated; large enough to be estimated; perceptible; as, an appreciable quantity. -- 
[adj] - enough to be estimated or measured
adjective enough to be estimated or measured; `appreciable amounts of noxious wastes are dumped into the harbor`
sufficient to be readily perceived or estimated; considerable: There is an appreciable difference between socialism and communism.