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supermoon
supermoon n. 
/ˈsjuːpəmuːn/,
Brit. /ˈsuːpəmuːn/
, /ˈsuːpəmuːn//ˈsjuːpəmuːn/U.S. /ˈsupərˌmun/
originally Astrology an occasion when the moon appears particularly large in the sky owing to the near coincidence of its closest approach to the Earth (perigee) with a full or new moon (syzygy); (also) the moon on such an occasion./ˈsupərˌmun/ΚΠ
1979 R. Nolle in Horoscope Sept. 26/2 (title) Supermoon: the deadly moon tide.
1995 Evening Standard (Nexis) 17 Nov. 36 Investors are also asked to beware of 22 December when eight planets will be ‘within 34 degrees of arc of each other’. This will coincide with the winter solstice and a ‘supermoon’—when a new moon happens at perigee, the closest point in the moon's orbit to the Earth.
2015 Baltimore Sun (Nexis) 1 Jan. (Local section) 2 a The highlight of 2015 for skywatchers could be the coincidence of a ‘supermoon’ and a late-night full lunar eclipse in September.
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