<p><strong>Noun</strong></p><ul><li>Geology: unbroken solid rock, overlaid in most places by soil or rock fragments</li><li>bottom layer; lowest stratum</li><li>any firm foundation or basis: Technical courses will be founded on a bedrock of sound, general education so as to produce a well-rounded engineer.</li><li>the fundamental principles, as of a teaching, belief, or science: Let's strip away the cant and get down to bedrock.</li></ul><p><strong>Adjective</strong></p><ul><li>basic; fundamental</li></ul>