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الفعل
اِجْتَمَعَ ; اِلْتَأَمَ ; اِنْعَقَدَ ; جَمَعَ ; دَعَا إلى اِجْتِماع
A convention is a set of agreed, stipulated, or generally accepted standards, social norms, or other criteria, often taking the form of a custom.
In a social context, a convention may retain the character of an "unwritten law" of custom (for example, the manner in which people greet each other, such as by shaking each other's hands). Certain types of rules or customs may become law and sometimes they may be further codified to formalize or enforce the convention (for example, laws that define on which side of the road vehicles must be driven).
In physical sciences, numerical values (such as constants, quantities, or scales of measurement) are called conventional if they do not represent a measured property of nature, but originate in a convention, for example an average of many measurements, agreed between the scientists working with these values.