which . ( Of the lat. )( qualis ). 1. pron. relat. It is unstressed Word and only variations in number. Which, which. 2. pron. relat. It is with article compound relative pronouns which, which, who, whom, which, with variation in gender and number, indicated by the article. That was his opinion, which I do not disagree. He had four sons, the youngest of whom I have known I. U less c. adj. great voices urged Sancho which Sancho, hearing was called, he left to the pastors.