<p><strong>Adjective:</strong></p><ul><li>pertaining to or of the nature of preliminary instruction.</li><li>introductory to some art or science.</li></ul><p><strong>Noun:</strong></p><ul><li>a propaedeutic subject or study.</li><li>propaedeutics (used with a singular verb): the preliminary body of knowledge and rules necessary for the study of some art or science.</li></ul>