in·ter·line
ˌin-tər-ˈlīn 
interlined; interlining; interlines
: to insert between lines already written or printed
: relating to, involving, or carried by two or more transportation lines
Examples of interline in a Sentence
Recent Examples on the Web
Alesandra Dubin, Travel + Leisure, 26 Sep. 2025
This practice, called interlining, gives passengers the ability to get to more parts of the city without transferring trains.
—Evan Simko-Bednarski, New York Daily News, 9 Dec. 2024
The French interlining company has expanded its product range beyond beyond its traditional offerings of innerlinings and inner-garment components to include cotton fabrics for the shirting sector.
—Alexandra Harrell, Sourcing Journal, 3 Sep. 2019
Dennis Green, AFAR Media, 29 May 2025
According to the March report, management is working on interline agreements with six major airlines where sales would start flowing through AccessRail starting in the second quarter.
—David Lyons, Sun Sentinel, 6 May 2025
The realignment includes exploring charter operations, bidding on Essential Air Service markets, and transitioning to a codeshare and interline relationship with American.
—Quartz Intelligence Newsroom, Quartz, 28 Mar. 2025
The airline also recently announced an interline partnership with Icelandair at BWI, meaning passengers can connect between Southwest and Icelandair flights on the same ticket.
—Zach Wichter, USA TODAY, 15 Feb. 2025
The airline recently launched a partnership with Southwest Airlines, offering interline connections from several gateway cities, including Baltimore and Nashville, to Iceland.
—Michael Cappetta, Travel + Leisure, 31 Jan. 2025
Southwest does not have interline agreements with other carriers that would allow its agents to rebook passengers on a different airline, leaving travelers in charge of exploring other options.
—CNN, 28 Dec. 2022
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Verb
Rated to keep you warm in temps down to 14 degrees Fahrenheit, this quality soft wool cashmere Aritzia coat has a slim silhouette, princess seams for shaping, and an ultra-thin vegan suede interlining for added warmth and wind protection.
—Alesandra Dubin, Travel + Leisure, 26 Sep. 2025
This practice, called interlining, gives passengers the ability to get to more parts of the city without transferring trains.
—Evan Simko-Bednarski, New York Daily News, 9 Dec. 2024
The French interlining company has expanded its product range beyond beyond its traditional offerings of innerlinings and inner-garment components to include cotton fabrics for the shirting sector.
—Alexandra Harrell, Sourcing Journal, 3 Sep. 2019
Adjective
The interline agreement, for example, will require a lot of backend development to integrate the two airlines’ systems, Hardtveldt noted.
—Dennis Green, AFAR Media, 29 May 2025
According to the March report, management is working on interline agreements with six major airlines where sales would start flowing through AccessRail starting in the second quarter.
—David Lyons, Sun Sentinel, 6 May 2025
The realignment includes exploring charter operations, bidding on Essential Air Service markets, and transitioning to a codeshare and interline relationship with American.
—Quartz Intelligence Newsroom, Quartz, 28 Mar. 2025
The airline also recently announced an interline partnership with Icelandair at BWI, meaning passengers can connect between Southwest and Icelandair flights on the same ticket.
—Zach Wichter, USA TODAY, 15 Feb. 2025
The airline recently launched a partnership with Southwest Airlines, offering interline connections from several gateway cities, including Baltimore and Nashville, to Iceland.
—Michael Cappetta, Travel + Leisure, 31 Jan. 2025
Southwest does not have interline agreements with other carriers that would allow its agents to rebook passengers on a different airline, leaving travelers in charge of exploring other options.
—CNN, 28 Dec. 2022
Cite this Entry
“Interline.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/interline. Accessed 30 Oct. 2025.
Copy CitationKids Definition
interline
1 of 2 verb
in·ter·line
ˌint-ər-ˈlīn
: to write between lines already written
interline
2 of 2 verb
: to provide a garment with an interlining
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