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| Subject | English | Basque |
| math. | coefficient of concentration | kontzentrazio-koefiziente |
| math. | concentration matrix | kontzentrazio matrize |
| math. | concentration parameter | kontzentrazio parametro |
| math. | curve of concentration | kontzentrazio-kurba |
| environ. | economic concentration The extent to which a market is taken up by producers within a given industry | kontzentrazio ekonomiko |
| math. | ellipse of concentration | kontzentrazio-elipse |
| math. | index of concentration | kontzentrazio-indize |
| environ. | maximum admissible concentration The maximum exposure to a physical or chemical agent allowed in an 8-hour work day to prevent disease or injury | gehienezko kontzentrazio onargarri |
| environ. | maximum immission concentration The maximum concentration of air polluting substances in the free environment whose impact when of specified duration and frequency is not objectionable to man, fauna and flora | gehienezko immisio-kontzentrazio |
| environ. | pollutant concentration A measure of the amount of a polluting substance in a given amount of water, soil, air, food or other medium | kutsatzaile-kontzentrazio |
| environ. | settlement concentration The distribution or total amount of communities, villages and houses within a specified geographic area | bizitegien kontzentrazio |
| environ. | sulphur concentration Sulphur content in a solution | sufre-kontzentrazio |
| environ. | urban concentration A process in which an increasing proportion of a country's population is concentrated in urban areas | hiri-kontzentrazio |