Source : Webster's Revised Unabridged Dictionary (1913)

Breakfast \Break"fast\, n. [Break + fast.]
   1. The first meal in the day, or that which is eaten at the
      first meal.

            A sorry breakfast for my lord protector. --Shak.

   2. A meal after fasting, or food in general.

            The wolves will get a breakfast by my death.
                                                  --Dryden.

Breakfast \Break"fast\, v. i. [imp. & p. p. {breakfasted}; p.
   pr. & vb. n. {Breakfasting}.]
   To break one's fast in the morning; too eat the first meal in
   the day.

         First, sir, I read, and then I breakfast. --Prior.

Breakfast \Break"fast\, v. t.
   To furnish with breakfast. --Milton.

Source : WordNet®

breakfast
     n : the first meal of the day (usually in the morning)

breakfast
     v 1: eat an early morning meal; "We breakfast at seven"
     2: provide breakfast for