noun a talk delivered during a religious service to instruct, enlighten, or inspire the congregation.The theme of the minister’s sermon was forgiveness.

adjective betraying or likely to betray trust; traitorous; faithless.The treacherous officer betrayed his general.

noun a false or assumed name.The escaped convict had been getting odd jobs using an alias. adverb otherwise known as; in other circumstances called.Bob Martin alias Roberto Martinez.