1650s, in Blount, "a cutting in small pieces," a sense now obsolete. In modern use, "act of dividing or state of being divided in segments," by 1851 in reference to cells, from segment (v.) + -ation.
1859 (implied in segmented), "divide or become divided into segments," in reference to cell division, from segment (n.). Transitive sense, "divide (something) into segments" is from 1872. Related: Segmenting.
the end of some nouns of action; see -ate + -ion.
updated on April 15, 2022