What is the meaning of the word "race"?

Definitions:

A contest of speed where participants ain to be the fastest over a certain distance or in performing a task. NOUN
- She won the 100-meter sprint race.
In biology, refers to a population within a species that is distinct in some way, especially a subspecies. NOUN
- People have killed so many tigers that two races are probably extinct.
Refers to groups of people who share common physical characteristics or ancestry, often linked to social, cultural, or historical backgrounds. NOUN
- Discussions about race and identity are central to understanding social issues.
To work as fast as possible towards a goal, sometimes in competition with others. VERB
- We are racing to find acure for AIDS.