Fundamental frequency is a term commonly used in physics and acoustics to refer to the lowest frequency of a periodic waveform. However, there are several synonyms that can be used to refer to this frequency. Some of the most commonly used terms include fundamental tone, first harmonic, and base frequency. Other terms that can be used interchangeably include fundamental pitch, primary frequency, and natural frequency. These synonyms are all used to describe the same basic concept, which is the frequency that defines the pitch or tone of a sound or waveform. By understanding the various synonyms for fundamental frequency, you can better communicate your ideas and concepts in scientific and technical discussions.