Noah Webster's New International Dictionary of the English Language

1. (v. i.) To ascertain or determine by mathematical processes, usually by the ordinary rules of arithmetic; to reckon up; to estimate; to compute.

2. (v. i.) To ascertain or predict by mathematical or astrological computations the time, circumstances, or other conditions of; to forecast or compute the character or consequences of; as, to calculate or cast one's nativity.

3. (v. i.) To adjust for purpose; to adapt by forethought or calculation; to fit or prepare by the adaptation of means to an end; as, to calculate a system of laws for the government and protection of a free people.

4. (v. i.) To plan; to expect; to think.

5. (v. i.) To make a calculation; to forecast consequences; to estimate; to compute.