ASCERTAIN, ASCERTAINABLE
ADJECTIVES
1648 ► COGNOSCIBLE ascertainable, capable of being known, knowable, recognizable
VERBS
1330 ► KEN to ascertain; to get to know, to find out → obs.
1862 ► LOOK-SEE to ascertain, to investigate; to determine → colloq.
1900 ► FADGE OUT to ascertain, to discover → Eng. dial. (Bk.)
1940 ► BEAM to ascertain what is happening → African-American sl.
Lexicophilia 