Dictionary.com
definitions

cal.

calendar.
caliber.
calorie(def 1a).

Cal.

California.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for cal.

cal.

abbreviation for

calendar
calibre
calorie (small)

Cal.

abbreviation for

Calorie (large)
California
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012