f1 = r1 = x1 (event; perhaps: spacetime coordinates) is an equinox for season x2 at location/of or for celestial body/object d3 = x3 with respect to orbit/sun x4.
This word is perfectly and exactly semantically equivalent to "dornilteikeznulfau", except at most in terms of emphasis and connotation and poetic value. Unlike the pair "3 = x3 with respect to orbit/sun x4.">ctenilteikezraifau" and "3 = x3 with respect to orbit/sun x4.">dornilteikezraifau", neither of the "equinox" words herein referenced thus far have a default or preference for any given season.