word of the day: boundary.
a line that marks the limits of an area; a dividing line.
bound + -ary.
bound. “to leap,” 1580s, from middle french bondir “ resound, echo”. "limit,” c. 1200, from anglo-latin bunda.
-ary. adjective and noun word-forming element, in most cases from latin (-arius, -aria, -arium) “connected with, pertaining to”.