a native or inhabitant of Bulgaria
"The bulgarian traveler shared stories about his hometown in Sofia."
a Slavic language spoken in Bulgaria
"She taught her children Bulgarian so they could communicate with their relatives back home."
A native of Bulgaria.
"The Bulgarian living next door invited me over for lunch today."
of or relating to or characteristic of Bulgaria or its people
"the Bulgarian capital is Sofia"
Relating to Bulgaria, its people, or the Bulgarian language.
"The bulgarian flag flies proudly over the capital city of Sofia."
In plain English: Bulgarian describes anything related to Bulgaria, which is a country located between Europe and Asia where people speak Bulgarian as their main language.
"The Bulgarian language is very similar to other Slavic languages like Russian and Polish."
The word comes from Bulgaria or Bulgar with the suffix -an or -ian added. It originally meant "of or relating to Bulgaria."