Definitions of more than:

• adjective:   greater in number relative to something else

  Example: "More than one person stood up"

• adjective:   (comparative of `much' used with mass nouns) a quantifier meaning greater in size or amount or extent or degree

  Example: "More than a gallon"

• adverb:   comparing quantity or quality

  Example: "By the time she was 4 she was more than half her father's height"