English to Persian Dictionary Online
Definition of "external validity"

Arabic-English Arabic-Russian Breton-French Azerbaijani-Azerbaijani Chinese-English Chinese-Italian Chinese-French Chinese-Korean Chinese-Spanish Chinese-Russian Chinese-Thai English-Arabic English-Chinese English-Croatian English-English English-French English-German English-Greek English-Hebrew English-Italian English-Japanese English-Korean English-Persian English-Portuguese English-Russian English-Spanish English-Swedish English-Thai English-Turkish English-Ukrainian French-Breton French-Chinese French-English French-French French-German French-Russian German-English German-Thai German-Russian Greek-English Hebrew-English Hebrew Thesaurus Italian-English Italian-German Italian-Russian Japanese-Chinese Japanese-English Japanese-Thai Korean-Chinese Korean-English Korean-Korean Portuguese-Chinese Portuguese-English Russian-Arabic Russian-Chinese Russian-English Russian-French Russian-German Russian-Italian Russian-Spanish Russian-Turkish Russian-Ukrainian Spanish-Chinese Spanish-English Spanish-German Spanish-Russian Thai-Chinese Thai-English Thai-French Thai-Japanese Thai-Russian Thai-Thai Turkish-English Turkish-Russian Turkmen-Turkmen Ukrainian-English Ukrainian-Russian