noun

• The most important part of a thing or aggregate of things wherever located and whether of any determinate location at all; the essence.
• The most important part of a thing or aggregate of things wherever located and whether of any determinate location at all; the essence.
• The most important part of a thing or aggregate of things wherever located and whether of any determinate location at all; the essence.
  "Photographs of cottagecore focuses on countrysides or forests."
• particular parts of technical instruments or machines essential in function:

adj

• (board sports) Deeply and authentically involved in the culture surrounding the sport.
  "Our interest is not in core skaters such as young males and pro skaters but the voices of those on the periphery of the subculture."

noun

• (obsolete) A body of individuals; an assemblage.
  "He was in a core of people."

noun

• (historical units of measure) Alternative form of cor: a former Hebrew and Phoenician unit of volume.