名詞 dec:

1. the last (12th) month of the year
   同義詞：December
2. (astronomy) the angular distance of a celestial body north or south of the celestial equator; expressed in degrees; used with right ascension to specify positions on the celestial sphere
   同義詞：declination, celestial latitude

1. If the account is settled before31st Dec.
   如果賬目在12月31日前結(jié)清，可減少一鎊半。