Definitions of overall:

• noun:   work clothing consisting of denim trousers (usually with a bib and shoulder straps)
• noun:   a loose protective coverall or smock worn over ordinary clothing for dirty work
• adjective:   including everything

  Example: "The overall cost"

• adjective:   involving only main features

  Example: "The overall pattern of his life"

• name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #13962)