How would you describe consciousness?

The word consciousness has many definitions, some very short and some definitions may take pages to write. I prefer to use the simple definition of the word consciousness: “having knowledge of something; being aware.” However, consciousness can also be measured in terms of “quantity.” A worm is “conscious” of its environment, a cat is conscious of its environment and a human is conscious of its environment. However, the “amount” of consciousness in a worm, a cat and a human are different. For example, the human has “more” consciousness than a worm. The smaller the object, such as molecules, atoms, and electrons, the less consciousness they have.