What does morse mean?
A morse is a unit used for measuring the duration of a light signal in optical telegraphy. It corresponds to the time needed to transmit a dot, the shortest element in the signalling system, and can therefore also describe the timing of dashes and gaps by comparison. The term belongs to an era when messages were sent visually by lamp, shutter, mirror, or other means rather than by sound or electricity. Although largely obsolete in everyday speech, it survives in specialized discussion of signalling and in historical accounts of telegraphy. In such contexts, a morse is best understood not as a complete message or code but as the basic unit of signal duration. It is related to the name of Samuel F. B. Morse, whose work helped establish the familiar electrical telegraph system and the coding method known as Morse code.
nounA unit of light signal used in optical telegraphy, corresponding to the time required to transmit a dot. The term is now chiefly associated with signalling by flashes of light.
- A unit of light-signal duration in optical telegraphy, especially the duration of a transmitted dot.
"The pilot answered the signal with a sequence of short flashes, each lasting one morse."
"The station operator held the lamp shutter open for one morse before closing it again."
"The pilot acknowledged the message with a brief morse of light."
The plural is rarely encountered because the word itself is uncommon.
"The operator measured the separation between the signals in morses."
A single flash in an optical telegraph could represent a dot, a dash, or a gap—and the whole timing system of a signal was measured in morses.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of morse
The word comes from the name of Samuel Finley Breese Morse, the American telegraph pioneer associated with the development of a practical telegraph system and alphabet. The specialized unit was named in recognition of Morse signalling and came to denote the duration of one dot in an optical signal.
How morse is actually used
This is an uncommon technical term associated chiefly with optical telegraphy, signalling, and early aviation. It should be distinguished from the proper name Morse and from the related proper noun Morse code; capitalization varies according to house style.