The definition of oxidation is loss of electrons. The definition is formation of additional bonds between carbon and oxygen (or in the number of carbon-hydrogen bonds.) These are similar because when forms a bond with electronegative , it essentially some of its attraction for its electrons.

Oxidation can be defined in many ways:

In terms of electron, Oxidation can be defined as loss of electrons by an atom or ion or a molecule during a reaction.

In terms of oxygen transfer, oxidation maybe defined as a substance that gains oxygen or loses hydrogen.

It can also be defined as a process in which a carbon atom gains bond to more electronegative atom such as oxygen.

it's filtration, but this is an assumption so my apologies if i got this