Where does “countdown” come from?

Countdown derives from English down combined with English count, which came from Anglo-Norman conte, from Latin comitatus meaning "retinue" or "company," ultimately from Latin comes meaning "companion."

countdown (English): A count backward in fixed units to the time of...

Definitions

  1. A count backward in fixed units to the time of...

Ancestry of “countdown”, step by step

countdown traces back through two separate lines of ancestry.

via English count

StepLanguageWordMeaning
1EnglishcountTo recite numbers in sequence; To determine the...
2Middle EnglishcountenTo count enumerate; give the number of
3Anglo-Normanconterto tell; to say; to recount; to add up
4Old Frenchconterto tell; to say; to recount; to add up
5Latincomputōto calculate, compute, reckon together
6Latincom-allomorph of con-
7Latincon-Used in compounds to indicate a being or bringing...
8Latincumwith, along with; at; -fold
9Old LatincomAlternative form of cum
10Proto-Italickomwith, along, at
11Proto-Indo-Europeanḱómbeside, near, by, with
12Proto-Indo-EuropeanḱeDeictic particle, here; Post-positional...
13Middle Englishkyt
14Germankittputty certain kinds of cement used for fixing e.g. window panes
15Old High Germankuti
16Proto-West Germanickwidugum, resin
17Proto-Germanickweduzresin
18Proto-Indo-Europeangʷet-resin, gum; to say, speak
19Proto-Indo-Europeangū-to bend; curve; arch; vault; to bow, bend, arch,...

via English Down

StepLanguageWordMeaning
1EnglishDownusually known as County Down
2Middle Englishdoundown
3Old Englishdūnhill, down; hill, dune; hill, mountain
4Proto-Germanic*dūnā
5Proto-Celticdūnomstronghold, rampart
6Proto-Indo-Europeandʰewh₂-smoke; mist, haze

Words derived from “countdown

Every word from Proto-Indo-European gū-
countdown — Etymology, Origin & Word History | Etymology Explorer