ETSI is providing definitions database (TEDDI) access online.
For example, for base station it gives:
A base station is a network element in radio access network responsible for radio transmission and reception in one or more cells to or from the user equipment. A base station can have an integrated antenna or be connected to an antenna by feeder cables.
In UTRAN it terminates the Iub interface towards the RNC. In GERAN it terminates the Abis interface towards the BSC