What is the meaning of the word "equatorial"?

Definitions:

  1. of or existing at or near the geographic equator copy to clipboard adjective
    • equatorial Africa copy to clipboard
  2. of or relating to conditions at the geographical equator copy to clipboard adjective
    • equatorial heat copy to clipboard
  3. of or relating to or at an equator copy to clipboard adjective
    • equatorial diameter copy to clipboard