the interval between two successive passages of the earth through perihelion; 365.25964 mean solar days
anomalistic year in American English
noun
Astronomy
the average interval between consecutive passages of the earth through the perihelion, equivalent to 365.26 days
Word origin
[1870–75]This word is first recorded in the period 1870–75. Other words that entered Englishat around the same time include: asymmetric, billing, giveaway, onshore, washout