When you see the word aggravated in the description of a crime, it's a more serious crime. Aggravated assault is more than a punch in the nose — it’s assault with the intent of causing serious bodily harm.
Aggravated is built on the Latin root gravis "heavy," as in gravity, and with the prefix ad-, it means "to make heavy." So robbery is one thing, but aggravated robbery is not only robbing someone, but also causing physical harm, and the punishment would be harsher than for simple robbery. The word is used more casually to mean "angered" — you're likely to be an aggravated customer if you’ve been waiting in line forever and someone cuts in front of you.