A designation is the act of officially naming, appointing, or identifying something or someone for a particular role or purpose. When a park receives the designation of “National Park,” it gains official recognition and protection. When someone receives the designation of team captain, they're formally chosen and recognized as the leader.

The word can also mean the title or name itself. A doctor's professional designation might be “pediatrician,” which tells you what kind of medicine they practice. A building's designation as a historical landmark means it carries that official label.

Think of designation as making something official rather than casual. Your teacher might casually suggest that someone help with attendance, but when she gives them the designation of “class monitor,” it becomes their actual job. Similarly, you might think a certain corner of your room is your reading spot, but when you put up a sign saying “Reading Nook,” you've given it a formal designation.

When something receives a designation, it gets marked or set apart from everything else in a clear, official way. Notice how designation involves both recognition and purpose: it names what something is while often defining what role it plays.