Definition of "coeval"

If, however, Orientalists be right in their interpretation of the name of Artaxerxes' queen, Parisatis, as Pari-zadeh (Peri-born), the Peri must be coeval with the religion of Zoroaster.

1828, Thomas Keightley, The Fairy Mythology, volume I, London: William Harrison Ainsworth, page 27

The differences between the Sao Khua dinosaur assemblage and the roughly coeval assemblages in China, notably those from the Jehol Group of NE China, have already been noted, and several hypotheses have been put forward, including differences in taphonomic conditions, and the existence of geographical or environmental barriers (Buffetaut et al. 2006; Fernandez et al. 2009).

2009, Eric Buffetaut, Late Palaeozoic and Mesozoic Ecosystems in SE Asia

[…] the fey grace, the elusive, shifty, soul-shattering, insidious charm that separates the nymphet from such coevals of hers […]

1955, Vladimir Nabokov, Lolita, 1st American edition, New York, N.Y.: G[eorge] P[almer] Putnam’s Sons, published August 1958, part 1, page 19

“That's your coeval, Keluga. He's trying to write the entire Roget's as a series of nested, rule-based schematics. Containment, relation, exclusion . .”“Coeval? I'm thirty-five, Lentz. That guy's a kid.”

1995, Richard Powers, Galatea 2.2, New York: Farrar, Straus, Giroux, page 77