What is ‘meaning’?

Meaning is synonymous with understanding - you “understand the meaning of” something. John is driving a Mercedes. Level 1 - Language : Definitions of the words and mechanical connection of those of the words with each other, according to the rules of English. A male human being is driving (definition of driving - is seated on the front seat with his hands on the steering and his legs on the controls below and the car is moving ahead) a car - Mercedes. Level 2 - Commonsense : Strict - the tyres of the Mercedes are rotating. John is not blind. Plausible assumptions - John is headed somewhere. John is wearing clothes. Level 3 - Deeper Analysis : Something specific about the Mercedes car. (This requires domain knowledge). Say, the battery is discharging at a rate of X.