elongation

noun

1. (countable, uncountable)The act of lengthening.
2. (countable, uncountable)The state of being lengthened.
3. (countable, uncountable)That which lengthens out; a continuation.
4. (countable, uncountable)The ratio of the extension of a material to the length of the material prior to stretching.
5. (countable, uncountable)A removal to a distance; a withdrawal; a being at a distance; a distance.
6. (countable, uncountable)The angular distance of a planet from the sun.

   “the elongation of Venus”