This study sought to investigate the rate of attrition in general and special vocabulary in and out of context. Participants of the study were 210 male Persian literature teachers with different years of non-exposure to English (2, 4, 5, 6, 7, 8 &10) after graduating from university. They were selected through purposive sampling from among 1000 Persian literature teachers from three provinces, namely Esfahan, Fars and Yasuj. Their age ranged between 25 and 35. The instrument included one translation task. The task consisted of 20 items of general words and 20 items of special words which were tested in and out of context. Results indicated that the rate of attrition increased gradually as the years of non-exposure to English increased. Also, it was found that the rate of attrition in special and contextualized lexicon is respectively less than general and de-contextualized lexicon.