What does inlet mean?
An inlet is, most commonly, a narrow inlet or sheltered indentation in a coastline, such as the inlet between two stretches of land. The word can also refer more generally to an opening through which something enters, as in a water inlet, air inlet, or inlet valve. In figurative use, an inlet may be a route or means of gaining access to a place, organization, or area of activity. The term often suggests a confined or protected passage, especially when describing water. Although the noun remains widely used in nautical, geographical, and technical settings, inlet as a verb meaning “to let in” is uncommon and sounds old-fashioned. Related concepts include entrances, channels, bays, and estuaries, while outlet provides a direct contrast because it permits escape or discharge rather than entry.
A natural indentation in a coastline, a narrow body of water leading into a larger one, or an opening or passage through which something enters.
"The inlet was calm despite the rough weather along the exposed coast."
The geographical sense is the most common. In technical contexts, it may designate a pipe connection, valve, or port that admits air or another fluid.
To let in, admit, or insert into a place or system.
"The old channel inleted seawater into the basin at high tide."
This use is uncommon in contemporary English and may sound archaic or technical.
The regular plural of the noun is inlets.
"Several narrow inlets pierce the island's rugged coastline."
The word inlet is a tiny instruction: let it in.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does inlet come from?
The word dates from Middle English and was formed from in- with a noun meaning a channel, watercourse, or passage. Its development from the idea of a way or channel of entry led to the modern geographical, mechanical, and figurative senses. The related outlet is built on the same underlying word for a passage or channel but uses the opposite directional element.
Related word forms
How inlet is actually used
The noun is standard in geography, nautical contexts, engineering, and plumbing. The verb is rare or archaic in modern English and is usually encountered in older writing.
Easily confused with inlet
An inlet is an opening or passage into a place or system, whereas an outlet provides a way for something to escape or leave.