ison definition, ison meaning | English dictionary

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      abbrev. for  
1    International Standards Organization  
2    Imperial Service Order (a Brit. decoration)  

iso-   ,   (before a vowel)   is-  
      combining form  
1    equal or identical  
2    indicating that a chemical compound is an isomer of a specified compound  
isobutane, isocyanic acid     
     (from Greek isos equal)  
ISO rating  
      n     (Photog)   a classification of film speed in which a doubling of the ISO number represents a doubling in sensitivity; for example, ISO 400 film requires half the exposure of ISO 200 under the same conditions. The system uses identical numbers to the obsolete ASA rating  
     (C20: from International Standards Organization)  
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ion, isogon, isonomy, isonome

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