Term: Attribute

An Attribute, sometimes just called a Attribute Score, Attribute Modifier or just a 'Modifier', is a creature's numbered attribute in their + or - in your Strength, Dexterity, Constitution, Intelligence, Wisdom, or Charisma.

The full rules text can be found at Attribute Modifiers/Scores

If you are using the Classic Attribute Score Numbering the Attribute Modifier will be the end result of those numbers after this equation.

(# - 10) / 2, round up
or
(Attribute Score - 10) / 2