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milliradian
milliradian n. 
/ˈmɪlɪˌreɪdɪən/, /ˈmɪləˌreɪdiən/
Brit. /ˌmɪlɪˈreɪdɪən/
, /ˌmɪlɪˈreɪdɪən//ˈmɪlɪˌreɪdɪən/U.S. /ˌmɪləˈreɪdiən/
, /ˌmɪləˈreɪdiən//ˈmɪləˌreɪdiən/ΚΠ
1946 Radar: Summary Rep. & Harp Project (U.S. National Defense Res. Comm., Div. 14) 142/1 Mil, abbreviation for milliradian, an angle of one-thousandth of a radian; one degree is 17.45 milliradians.
1956 Spaceflight 1 28/1 Despite errors caused by ionospheric refraction of the signal, the use of data from a number of stations will, it is claimed, enable the satellite's position to be established to within a fraction of a milliradian.
1994 Analog Sci. Fiction & Fact Jan. 186/2 The average angular diameter of the Sun in the sky is 9.30 milliradians.
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