Science / Geology / Primary Seismic Waves: The fastest set of earthquake vibrations - also known as P-waves. They move through the Earth in compression and expansion motions (much like sound waves move through air). Called primary because they are the first recorded at a seismograph. Primary waves are able to travel through both solids and liquids.
Primary Adverb Synonyms: first, prime, principal, chief, main, leading, pre-eminent, cardinal, fundamental, basic, essential, predominant, elementary, elemental, underlying
Primary Adjective Synonyms: firsthand, direct, immediate
Science / Marine Biology / Primary Production: The production of living matter by photosynthesizing organisms or by chemosynthesizing organisms. Usually expressed as grams of carbon per square meter per year MORE
Science / Psychiatry / Primary Process: In psychoanalytic theory, the generally unorganized mental activity characteristic of the unconscious. This activity is marked by the free discharge of energy and excitation without regard to the dema MORE