1 tr. ascertain or determine beforehand, esp. by mathematics or by reckoning.
2 tr. plan deliberately.
3 intr. (foll. by on, upon) rely on; make an essential part of one's reckoning (calculated on a quick response).
4 tr. US colloq. suppose, believe.
Derivatives:
calculative adj.
Etymology: LL calculare (as CALCULUS)
Useful english dictionary. 2012.