What are true or false, it will be widely agreed, are propositions. But it would not be so widely agreed were it not for ambiguity of "proposition'. Some understand the word as referring to sentences meeting certain specifications. Others understand it as referring rather to the meanings of such sentences. What looked like wide agreement thus resolves into two schools of thought: for the first school the vehicles of truth and falsity are the sentence, and for the second they are the meanings of the sentences.