Longman Dictionary of Contemporary English - engagement

~ n 1 an agreement to marry someone  (They've officially announced their engagement. | break off your engagement (=say you no longer want to marry someone)) 2 an arrangement to do something or meet someone  (He has engagements this month at various clubs. | prior/previous engagement (=an arrangement you have already made))  (I won't be able to make it - I have a prior engagement.) 3 technical a battle between armies, navies etc 4 the fitting together of the working parts of a machine