adjective
- pertaining to 600 or a period of 600 years; marking the completion of 600 years.
noun, plural sex·cen·ten·ar·ies.
- a 600th anniversary or its celebration.
adjective
- of or relating to 600 or a period of 600 years
- of, relating to, or celebrating a 600th anniversary
noun plural -naries
- a 600th anniversary or its celebration