Definitions of fill:

• noun:   a quantity sufficient to satisfy

  Example: "He ate his fill of potatoes"

• noun:   any material that fills a space or container

  Example: "There was not enough fill for the trench"

• verb:   appoint someone to (a position or a job)
• verb:   assume, as of positions or roles
• verb:   plug with a substance

  Example: "Fill a cavity"

• verb:   become full

  Example: "The pool slowly filled with water"

• verb:   make full, also in a metaphorical sense

  Example: "Fill a container"

• verb:   occupy the whole of

  Example: "The liquid fills the container"

• verb:   eat until one is sated

  Example: "He filled up on turkey"

• verb:   fill or meet a want or need
• verb:   fill to satisfaction
• name:  A surname (very rare: popularity rank in the U.S.: #24677)