Question

what is ment by oxidation ?

Answer 1

★ In a reaction if oxygen is gained or hydro6is loosed, it is called an oxidation reaction.

OR

★ In a reaction if the oxidation number of an element is increased it is called as that the element is oxidised.

Answer 2

oxidation is addition of oxygen to a molecule or element

(or)
oxidation is addition of electronegative element to a compound

(or)
oxidation is removal or loss of electron from the compound

hope it helps