The overall meaning of the word overall is that it covers all the parts of something. For example, the individual parts don't matter as much as the overall value.

The word overall is the sum of its parts. Take the word over, meaning "above," and add it to the word all, meaning "everything" and you get overall, meaning "above everything". But remember, it's an adjective as in the overall impression of the music, the overall effect of the new tax code, the overall direction (as opposed to individual little changes.) Remember that overalls, the clothes you wore as a kid, went "over all" your other clothes.

Definitions of overall
  1. adjective
    involving only main features
    “the overall pattern of his life”
    applying to all or most members of a category or group
  2. adjective
    including everything
    “the overall cost”
    before any deductions
  3. noun
    (usually plural) work clothing consisting of denim trousers (usually with a bib and shoulder straps)
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    type of:
    work-clothes, work-clothing
    clothing worn for doing manual labor
  4. noun
    a loose protective coverall or smock worn over ordinary clothing for dirty work
    synonyms: boilers suit, boilersuit
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    type of:
    a loose-fitting protective garment that is worn over other clothing
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