Definitions
1.VerbTo deal cards to someone entering a game; to enter someone into a game by dealing cards to that person.
2.VerbTo trade (buy and sell) a named commodity.
3.VerbTo accept (something or a piece of information) as a basis for a decision. (Can we add an example for this sense?)
4.VerbTo have an interest in something. (Can we add an example for this sense?)
5.VerbTo give (someone) a share or portion of something; to include (someone) in a plan or scheme."We can deal you in on the robbery."