The property or tendency of the fluid to exert an upward force on the object immersed in it.
When a body is partly or wholly immersed in a fluid, the fluid exerts an upward force on the body. This phenomenon is called buoyancy. The upward force experienced by a body when partially or wholly immersed in a fluid is called upthrust or buoyant force.
The force acting in upward direction on an object when immersed in a liquid

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The force exerted by water opposing gravity to throw any object upwards is known as buoyant force and this situation is known as buoyancy

Buoyancy is the force that causes objects to float. It is the force exerted on an object that is partly or wholly immersed in a fluid. Buoyancy is caused by the differences in pressure acting on opposite sides of an object immersed in a static fluid. It is also known as the buoyant force. Buoyancy is the phenomena due to Buoyant Force.
किसी तरल में आंशिक या पूर्ण रूप से डूबी किसी वस्तु पर उपर की ओर लगने वाला बल उत्प्लावन बल कहलाता है। उत्प्लावन बल नावों, जलयानों, गुब्बारों आदि के कार्य के लिये जिम्मेदार है। source – Google baba ???
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It is the tendency or ability to float in al liquid or gas