What is the meaning of anaerobic?

Anaerobic Respiration is when glucose breaks down with out oxygen. Chemical reaction transfers glucose to the cell. Anaerobic reaction produces lactic acid rather than carbon dioxide and water.

Anaerobic exercise is a type of exercise that breaks down glucose in the body without using oxygen, as anaerobic means "without oxygen". In practical terms, this means that anaerobic exercise is harder but shorter than aerobic exercise

Explanation:

because that is what it is