英和和英

The contribution of migration (801-3) to overall population growth (701-1) is due to net migration ², i.e., the difference between the number of arrivals ³ and the number of departures ⁴. Net migration can have a negative or a positive sign; net immigration ⁵ or net in-migration ⁵ is used when arrivals exceed departures, and net emigration ⁶ or net out-migration ⁶ when the opposite is true. The sum of arrivals and departures in a country can be used to measure the volume of migration ⁷. A similar concept, applied to sub-areas of a country, is the migration turnover ⁸. The net stream ⁹ or net interchange ⁹ of migration between two areas is defined as the difference between the stream (803-9) and the counterstream (803-11), whereas the gross interchange ¹⁰ is the sum of stream and counterstream.

• 2. This may also be called the balance of migration or the migration balance. Terms such as "net migrant" should be avoided, and phrases such as the net number of migrants should be preferred.

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