Basal temperature refers to the body temperature measured in the morning just after waking up, before any physical activity or eating. It is primarily used to track ovulation and infertility but can also be an indicator of overall health. There are several synonyms for basal temperature including 'resting temperature,' 'morning temperature,' 'minimum temperature,' and 'basal body temperature.' These terms refer to the same concept of measuring the lowest body temperature in the body's circadian rhythm cycle. Health professionals and researchers use basal temperature measurements as a diagnostic tool to determine body temperature fluctuations, monitor the menstrual cycle, and track infertility.