Full Definition of AUTISM. : a variable developmental disorder that appears by age three and is characterized by impairment of the ability to form normal social relationships, by impairment of the ability to communicate with others, and by stereotyped behavior patterns.â auÂ·tisÂ·tic \oÌ-Ëtis-tik\ adjective or noun. a variable developmental disorder that appears by age three and is characterized by impairment of the ability to form normal social relationships, by impairment of the ability to communicate with others, and by stereotyped behavior patterns.
Other organizations have established a variety of alternative definitions for their standard reference conditions. In chemistry, IUPAC has established two standards: standard temperature and pressure (STP) as a temperature of 273.15 K (0 Â°C, 32 Â°F) and an absolute pressure of exactly 100 kPa (1 bar).
Body temperature norms. Normal body temperature varies by person, age, activity, and time of day. The average normal body temperature is generally accepted as 98.6Â°F (37Â°C). Some studies have shown that the normal body temperature can have a wide range, from 97Â°F (36.1Â°C) to 99Â°F (37.2Â°C). A temperature over 100.4Â°F (38Â°C) most often means you have a fever caused by an infection or illness.