regnal

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reg·nal

R0126500 (rĕg′nəl)adj. Being a specified year of a monarch's reign calculated from the date of accession: in her 12th regnal year.
[Medieval Latin rēgnālis, royal, from Latin rēgnum, reign; see reign.]

regnal

(ˈrɛɡnəl) adj1. (Government, Politics & Diplomacy) of a sovereign, reign, or kingdom2. (Government, Politics & Diplomacy) designating a year of a sovereign's reign calculated from the date of his or her accession[C17: from Medieval Latin rēgnālis, from Latin rēgnum sovereignty; see reign]

reg•nal

(ˈrɛg nl)

adj. of or pertaining to a sovereign, sovereignty, or reign: the second regnal year of Louis XIV. [1605–15; < Medieval Latin rēgnālis= Latin rēgn(um) rule, kingdom + -ālis -al1; compare reign]