- Aesthetics: The study of science and philosophy of beauty in art.
- Aetiology: It is the science of causation.
- Agrobiology: The science of plant life and plant nutrition.
- Agriculture: It is the science of cultivating the ground, harvesting crops and rearing and management of farming, husbandry and livestock.
- Agronomy: The science of soil management and crop production.
- Algebra: A branch of Mathematics dealing with using symbols, letters and characters to represent numbers in mathematical expressions.
- Anatomy: It is the study of the structure and organization of the human body.
- Anthropology: The science that deals with the origin and physical and cultural development of mankind.
- Apiculture: The science of raising bees. It involves cultivating and managing bee cultures for the commercial sale of honey.
- Applied Mathematics:The science of using mathematical techniques in fields other than mathematics.