名詞 declination:

1. a condition inferior to an earlier condition; a gradual falling off from a better state
   同義詞：decline
2. a downward slope or bend
   同義詞：descent, declivity, fall, decline, declension, downslope
3. (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：celestial latitude, dec
4. a polite refusal of an invitation
   同義詞：regrets

dec.li.na.tion

n.Abbr. dec.（名詞）縮寫 dec.
A sloping or bending downward.
下傾：朝下的傾斜或彎曲
A falling off, especially from prosperity or vigor; a decline.
衰退：尤指從繁榮或精力充沛的狀況衰弱下來；衰落
A deviation, as from a specific direction or standard.
偏離：如從某一特定方向或標(biāo)準(zhǔn)等的偏離
A refusal to accept.
婉拒，謝絕
Magnetic declination.
磁偏角，磁偏差
Astronomy The angular distance to a point on a celestial object, measured north or south from the celestial equator.
【天文學(xué)】 赤緯：到達(dá)某天體一點(diǎn)的角距，從天體赤道向北或向南測量得出

來源：
Middle English declinacioun
中古英語 declinacioun
from Old French declination
源自 古法語 declination
from Latin dôclon3tiô dôclon3tiôn-
源自 拉丁語 dôclon3tiô dôclon3tiôn-
from dôclon3tus [past participle of] dôclon3re [to turn away] * see decline
源自 dôclon3tus [] dôclon3re的過去分詞 [趕走，解散] *參見 decline

【引伸】
dec.lina.tional
adj.（形容詞）