The term 'anaerobic' is a nine-letter word meaning 'not requiring oxygen'. It is used to describe organisms, activities, and processes that do not require oxygen for survival or growth. Anaerobic organisms are able to survive and thrive in environments without oxygen, such as deep sea vents and swamps. Anaerobic activities, such as weightlifting, involve short bursts of energy that do not require oxygen. Anaerobic processes, such as fermentation, are chemical reactions that occur without the presence of oxygen.