olemus
muutuja, mis koosneb ettemääratud arvust naaberbittides
= a variable that consists of a specified number of adjacent bits

ISO/IEC 8211:
a data field comprising only binary digits

ülevaateid
https://en.wikipedia.org/wiki/Bit_field

https://www.ibm.com/support/knowledgecenter/en/ssw_ibm_i_73/rzarg/defbitf.htm