Many factors affect the existence and usage of any given human language, including the size of the native speaking population, its use in formal communication, and the geographical dispersion and the socio-economic weight of its speakers.

Chizhevsky proposed that not only did geomagnetic storms resulting from sunspot-related solar flares affect electrical usage, plane crashes, epidemics and grasshopper infestations, but human mental life and activity.

Reflected meaning has to do with when one sense of a particular word affects the understanding and usage of all the other senses of the word.

The ban did not affect scientific or medical usage.

In seeking to establish the role of headhunting within the general economic environment, the survey questioned whether or not the Big Bang of October 1986 and the stock market crash of a year afterwards affected companies' recruiting policies and usage of headhunters.

These changes affect only official usage in Turkey; the Turkish government has no authority over international scientific usage.

The Duplex-Cyclone had reliability issues of its own, and this affected the DC-7's service record and usage.

However, these efforts failed to significantly affect usage in large, metropolitan areas, and in by the end of the effort, national seat belt usage had reached only 15%.

While the court holding has not affected usage and access to Lake Coeur d'Alene, the Environmental Protection Agency has ruled that the Tribe may set its own water-quality standards on its portion of Lake Coeur d'Alene.

Because of the widespread use of dictionaries in schools, and their acceptance by many as language authorities, their treatment of the language does affect usage to some degree, with even the most descriptive dictionaries providing conservative continuity.