Twice I have been to graduation ceremonies where the same principal has used the word "commence" to mean "end" rather than "begin." I would like to write to him and tell him that although logic is on his side and I have always thought that a more appropriate word could be used at graduations, he has embarrassed himself in front of those who expect more from a man of his position.
My question: should I bother? Will it make a difference? And how often have you heard someone who should know better misuse a word in a situation where it is an affront?