\pɹɪɡəstˈe͡ɪʃən], \pɹɪɡəstˈe‍ɪʃən], \p_ɹ_ɪ_ɡ_ə_s_t_ˈeɪ_ʃ_ə_n]\
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2010 - New Age Dictionary Database
By Oddity Software
1914 - Nuttall's Standard dictionary of the English language
By Nuttall, P.Austin.
1871 - The Cabinet Dictionary of the English Language

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  • any of various proteins secreted by cells the immune system that serve to regulate
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