precessionn.
英 prɪ'seʃ(ə)n | 美 prɪ'sɛʃən
中文n. 岁差（等于precession of the equinoxes）；先行；优先
词根词源
precession (n.)1590s, from Late Latin praecissionem (nominative praecissio) "a coming before," from past participle stem of Latin praecedere "to go before" (see precede). Originally used in reference to calculations of the equinoxes, which come slightly earlier each year.
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