greatest

The adjective has 5 meanings:

Meaning #1: not to be surpassed
  Synonym: top

Meaning #2: greatest in size of those under consideration
  Synonyms: biggest, largest

Meaning #3: greatest in importance or degree or significance or achievement
  Synonyms: leading, preeminent

Meaning #4: most of

Meaning #5: highest in quality
  Synonyms: sterling, superlative