prime target

:  the second of the canonical hours

:  the first hour of the day usually considered either as 6 a.m. or the hour of sunrise

:  the earliest stage

:  first in time :  original

:  of, relating to, or being a prime number — compare relatively prime

:  having no polynomial factors other than itself and no monomial factors other than 1

:  fill, load

:  to prepare for firing by supplying with priming

:  to insert a primer into (a cartridge case)

:  a mark to shoot at

:  a target marked by shots fired at it

:  something or someone fired at or marked for attack

:  to make a target of

:  to set as a goal

:  to direct or use toward a target