What is the meaning of greatest?

adjective

• Relatively large in size or number or extent; larger than others of its kind.
  • usage: "a great juicy steak"; "a great multitude"; "the great auk"; "a great old oak"; "a great ocean liner"; "a great delay"
  • synonyms: great
• Of major significance or importance.
  • usage: "a great work of art"; "Einstein was one of the outstanding figures of the 20th centurey"
  • synonyms: great, outstanding
• Remarkable or out of the ordinary in degree or magnitude or effect.
  • usage: "a great crisis"; "had a great stake in the outcome"
  • synonyms: great
• Very good.
  • usage: "he did a bully job"; "a neat sports car"; "had a great time at the party"; "you look simply smashing"
  • synonyms: bang-up, bully, corking, cracking, dandy, great, groovy, keen, neat, nifty, not bad, peachy, slap-up, swell, smashing
• Uppercase.
  • usage: "capital A"; "great A"; "many medieval manuscripts are in majuscule script"
  • synonyms: capital, great, majuscule
• In an advanced stage of pregnancy.
  • usage: "was big with child"; "was great with child"
  • synonyms: big, enceinte, expectant, gravid, great, large, heavy, with child
• Highest in quality.
  • synonyms: sterling, superlative