What does eyeblink mean?
An eyeblink is both a concrete event and a measure of time: the single, rapid closing and opening of the eyelid, lasting only a fraction of a second. Because that motion is among the fastest voluntary movements humans make, the word has taken on a natural figurative sense, describing anything that happens so quickly it seems instantaneous — a decision made in an eyeblink, a chance gone in an eyeblink. Writers and scientists alike favor the term for its precision: unlike vaguer words such as "moment" or "second," an eyeblink evokes a specific, bodily rhythm of time. The compound is transparent — simply "eye" plus "blink" — and its meaning is immediately graspable even to those encountering it for the first time. It carries no strong emotional coloring, lending it a neutral, slightly clinical tone suited to descriptive and technical prose, though it also works well in vivid narrative writing where brevity needs to be felt rather than measured.
nounThe brief act or duration of closing and opening the eyelid once; a very short space of time.
- The act of closing and opening the eyes once.
- A figuratively very short interval of time.
"In the eyeblink it took to glance away, the magician had swapped the card."
"She caught the falling glass in an eyeblink."
"The whole meeting was over in an eyeblink compared to last week's marathon session."
The plural is regular but relatively rare, since the word usually denotes a generic unit of time; it appears most often in scientific contexts counting actual blinks.
"The sensor recorded several eyeblinks per minute during the test."
An eyeblink lasts roughly a tenth of a second — which is why magicians hide their secrets inside one.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of eyeblink
Eyeblink is a straightforward English compound formed from "eye" (Old English ēage) and "blink" (Middle English blinken), a verb likely of Middle Dutch or Low German origin related to words meaning to shine or to close the eyes suddenly. The compound arose as a natural descriptive formation for the rapid motion of the eyelids. Its Germanic roots connect it to cognates such as Dutch and German verbs of similar form and meaning.
How eyeblink is actually used
"Eyeblink" is somewhat more formal or technical in register than the everyday phrase "in a blink," and appears often in scientific writing on perception and attention, where it names a measurable unit of time (the "attentional blink" literature notwithstanding). It is almost always used with "in" when meaning a short interval.
Easily confused with eyeblink
An eyelid is the physical flap of skin that covers the eye, whereas an eyeblink is the quick action of closing and opening it.