Back to explorer

entry

simultaneous

/ˌsɪməlˈteɪniəs/

Happening or existing at the same time

From Latin simul (together).

adjective
simul
Latin
Verified
simul
“together; at the same time”

from Medieval Latin simultaneus , ultimately

+1 more source
Medieval Latin
Verified
simultaneus
“simultaneous; occurring together”

from Medieval Latin simultaneus , ultimately

+1 more source
English, 1650s
Verified
simultaneous
Describing events that happen at the same moment

from Latin simul "at the same time," which is related to similis "like, resembling, of the same kind" (see similar )....

+1 more source
Modern English
simultaneous

Picture two events striking the same instant: that is the basic image behind Latin simul, meaning “together” or “at the same time.” The word traveled into Medieval Latin as simultaneus and arrived in English in the 1650s, when scholars were busy furnishing English with technical vocabulary. Its family has a surprising resemblance theme: simul is related to Latin similis, “like,” which also gave English similar and simile—things are alike because they seem to belong together. Mark Twain later treated simultaneous as if it were a verb and coined simultane, meaning “to do something at the same time as something else,” in 1880. So when two screens refresh together, two clocks chime together, or two students raise their hands together, they are all quietly acting out the ancient Latin idea of simul.

§