Convertible each into the other; capable of being exchanged equivalently, the one for the other: as, interconvertible terms.

What do you mean by Inter convertible?

Interconvertibleadjective. convertible the one into the other; as, coin and bank notes are interconvertible.

Whats is the meaning of matter?

the substance or substances of which any physical object consists or is composed: the matter of which the earth is made. physical or corporeal substance in general, whether solid, liquid, or gaseous, especially as distinguished from incorporeal substance, as spirit or mind, or from qualities, actions, and the like.