This is the 6787th most frequent Polish word.
fiba
"Fiba" is Polish slang for a fabrication, lie, or untruth.
In this sentence, 'FIBA' is used as a proper noun, referring to the International Basketball Federation.
FIBA jest organizacją odpowiedzialną za międzynarodową koszykówkę.
FIBA is the organization responsible for international basketball.
Here, 'FIBA' is again used as a proper noun as it mentions the Federation in the context of organizing an event.
Ostatnio widziałem mistrzostwa organizowane przez FIBA.
Recently, I watched the championship organized by FIBA.
'FIBA' in this context pertains to the name of the basketball regulation body during an event associated with it.