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
in·ter·lin·e·a·tion
1
: the act of interlining
2
: something interlined
interlineations in a later hand
editorial interlineations
a printed form with typewritten interlineations—
New York Times
New York TimesExamples of interline in a Sentence
Recent Examples on the Web
Christopher Elliott, Forbes.com, 15 Mar. 2026
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
Ted Reed, Forbes.com, 21 Mar. 2026
Additionally, a merger would enable railroads to compete more effectively with long-haul trucking due to the presence of a single-line service, as opposed to an interline service where interchange points can reduce service reliability.
—Glenn Taylor, Sourcing Journal, 19 Dec. 2025
In a ceremony celebrating the inaugural flight, Phoenix aviation officials and China Airlines staff highlighted an interline partnership between China Airlines and Southwest Airlines that's slated to begin in early 2026.
—Michael Salerno, AZCentral.com, 4 Dec. 2025
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
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Verb
Surf Air already has interline partnerships with Hawaiian, Alaska, Japan Airlines, American, and United — meaning passengers connecting off those carriers can flow directly onto Surf Air's network.
—Christopher Elliott, Forbes.com, 15 Mar. 2026
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
Etihad has an interline agreement with American, which operates about 90% of Charlotte departures.
—Ted Reed, Forbes.com, 21 Mar. 2026
Additionally, a merger would enable railroads to compete more effectively with long-haul trucking due to the presence of a single-line service, as opposed to an interline service where interchange points can reduce service reliability.
—Glenn Taylor, Sourcing Journal, 19 Dec. 2025
In a ceremony celebrating the inaugural flight, Phoenix aviation officials and China Airlines staff highlighted an interline partnership between China Airlines and Southwest Airlines that's slated to begin in early 2026.
—Michael Salerno, AZCentral.com, 4 Dec. 2025
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
Cite this Entry
“Interline.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/interline. Accessed 23 Jun. 2026.
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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