definitions

principal focus

noun Optics.

focal point(def 1).

Nearby words

principal artery of thumb, principal axis, principal boy, principal clause, principal diagonal, principal focus, principal ideal, principal ideal domain, principal nursing officer, principal optic axis, principal parts

Origin of principal focus

First recorded in 1825–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for principal focus

principal focus

noun

another name for focal point
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