email vs third class

email

• A quantity of messages sent through an email system. 

• A message sent through an email system. 

• An email address. 

• A system for transferring messages from one computer to another, usually through a network. 

• To send (something) through email. 

• To send, or compose and send, an email or emails. 

• To send an email or emails to. 

third class

• A reduced-rate mail service for printed matter. 

• The cheapest accommodation on a train or ship.