standard(1. Something considered by an authority or by general consent as a basis of comparison. 2. An object regarded as the most common size or form of its kind. 3. A rule or principle that is used as a basis for judgment. 4. An average or normal quality, quantity, or level)
staple food(The most commonly or regularly eaten food in a country or community and which forms the mainstay of the total calorie supply, especially in the poorer populations and at times of food shortage)