1. to prepare the preliminary sketch or the plans for (a work to be executed). 2. to plan and fashion artistically or skillfully. 3. to intend for a definite purpose. 4. to form or conceive in the mind; contrive; plan 1. a system of principles for guidance in practical affairs. 2. the rational investigation of the truths and principles of being, knowledge, or conduct. 3. a system of philosophical doctrine 4. the critical study of the basic principles and concepts of a particular branch of knowledge.