How is the term 'redox' defined in the context of electrochemical cells?

The term 'redox' is indeed defined as encompassing both reduction and oxidation reactions. This concept is central to electrochemical cells, where the processes of oxidation (loss of electrons) and reduction (gain of electrons) occur simultaneously. In a redox reaction, one species donates electrons, which is known as oxidation, while another species accepts those electrons, referred to as reduction.

In electrochemical cells, this interplay is fundamental, as the anode is where oxidation occurs, and the cathode is where reduction takes place. The electrons flow from the anode to the cathode through an external circuit, generating electric current as a result of these redox reactions. Therefore, recognizing 'redox' as the combination of these two types of reactions is crucial for understanding the functioning of electrochemical cells and the principles of electrochemistry.