POLLUTANT STANDARD INDEX (PSI)

\pəlˈuːtənt stˈandəd ˈɪndɛks sˈa͡ɪ], \pəlˈuːtənt stˈandəd ˈɪndɛks sˈa‍ɪ], \p_ə_l_ˈuː_t_ə_n_t s_t_ˈa_n_d_ə_d ˈɪ_n_d_ɛ_k_s__ s_ˈaɪ]\

Definitions of POLLUTANT STANDARD INDEX (PSI)

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1910 - Black's Law Dictionary (2nd edition)
By Henry Campbell Black

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international pitch

  • the pitch used to tune instruments for concert performances; usually assigns 440 Hz A above middle C
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