established or well-known or widely recognized as a model of authority or excellence | conforming with or constituting a norm or standard or level or type or social norm; not abnormal |
conforming to or constituting a standard of measurement or value; or of the usual or regularized or accepted kind | in accordance with scientific laws |
conforming to the established language usage of educated native speakers | being approximately average or within certain limits in e.g. intelligence and development |
commonly used or supplied | forming a right angle |
regularly and widely used or sold | |