What does echolocation mean?
Echolocation is the process of determining the location, distance, and sometimes shape of objects by producing sound and analysing the echoes that bounce back. The word combines 'echo', from the Greek 'ēchō' meaning sound, with 'location', reflecting its core function of spatial positioning. Echolocation is best known as a sensory ability of certain animals: bats emit high-frequency cries and interpret the returning echoes to hunt insects and avoid obstacles in total darkness, while dolphins and some whales use it to navigate and capture prey underwater where sight is unreliable. Remarkably, some humans who are blind have learned to use echolocation deliberately, making tongue clicks or tapping sounds to build a mental map of their surroundings. In scientific writing, the term also extends to engineered systems such as sonar, which applies the same principle using transmitted pulses and reflected signals.
nounThe perception of objects in the environment by detecting echoes reflected from them, typically by emitting sound waves and interpreting the returning echoes. It is used especially by animals such as bats and dolphins, and by humans with visual impairment as a navigational aid.
- The biological ability of certain animals to locate objects by emitting sounds and interpreting the echoes that return.
- The analogous human skill of perceiving one's surroundings using self-generated sounds, practised by some people with visual impairment.
- By extension, any technique of determining position or shape of objects through reflected waves, including technological sonar systems.
"Bats navigate the darkened cave using echolocation, emitting high-frequency calls and listening for their echoes."
"Dolphins use echolocation to find fish even in murky water where vision fails."
"After losing his sight, he learned echolocation, clicking his tongue to sense doorways and obstacles around him."
Rarely used in the plural; the noun is almost always uncountable. A plural form may occasionally appear when referring to distinct instances or measurements of echolocating behaviour, but this is uncommon.
"The study compared the echolocations of different bat species across varying habitats."
Some blind people have taught themselves to 'see' with echolocation — clicking their tongues and reading the echoes like a bat, well enough to ride a bike.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of echolocation
The word echolocation was formed in English during the twentieth century from two established roots: 'echo', derived from the Greek 'ēchō' meaning sound, and 'location', from the Latin 'locare', meaning to place or position. It emerged as scientists described how bats and other animals navigate and hunt by sound rather than sight, replacing earlier descriptive phrases such as 'sound ranging'. Related words sharing these roots include echoic terms like 'echogram' and positional terms like 'relocate'. The concept itself had been observed informally for centuries — Italian naturalist Lazzaro Spallanzani studied bat navigation in the eighteenth century — but the modern term crystallised only once the underlying mechanism was understood scientifically.
How echolocation is actually used
Echolocation is a technical/scientific term, neutral in register. It appears frequently in zoology, biology, and popular science writing. It is an uncountable noun in most contexts.
Easily confused with echolocation
Sonar is a human-engineered technology using sound waves underwater, whereas echolocation is the biological or natural process of locating objects via reflected sound.