Multiple meanings:
1. An
extravagant swordsperson or adventurer of some sort.
2. A sword-weiling hero/villain/person
3. A play, movie, or book dealing with a swashbuckler, one who swashbuckles.
IMPORTANT NOTE:
SWASHBUCKLERS ARE NOT ALWAYS PIRATES! Yes, most pirates are
swashbucklers, but not all swashbucklers are pirates! Also, not all pirates OR swashbucklers are MALE! Get it? Got it? Good.