With more than 3000 terms, the fields covered in the Dictionary of Pure and Applied Physics (DPAP) are acoustics, biophysics and medical physics, communication, electricity, electronics, geometrical optics, low temperature physics, magnetism, and physical optics. Like most other branches of science, physics has grown rapidly over the last decade. As such, many of the terms used in older books have become obsolete and new terms have appeared in scientific and technical literature. Care has been taken to ensure that old terms are not included in the DPAP and new terminologies are not missed. Some of the terms are related to other fields, e.g., engineering fields (mostly electrical and mechanical), mathematics, chemistry, biology.