1.VerbTo determine the value of something or the solution to something by a mathematical process.
"Calculate the square root of 3 to 10 decimal places."
2.VerbTo determine values or solutions by a mathematical process; reckon.
3.VerbTo plan; to expect; to think.
4.VerbTo ascertain or predict by mathematical or astrological computations the time, circumstances, or other conditions of; to forecast or compute the character or consequences of.
"to calculate or cast one’s nativity"
5.VerbTo adjust for purpose; to adapt by forethought or calculation; to fit or prepare by the adaptation of means to an end.
"to calculate a system of laws for the government and protection of a free people"
6.VerbTo imagine sequences of potential moves and responses without actually moving the pieces.