What does "interline" mean?

To write or insert between lines already written or printed, as for addition or correction.

What is a synonym for "interline"?

Common synonyms include: ceil, face, feather, fill, inlay, line.

Pronounced //ˈɪntə(ɹ)ˌlaɪn//.

//ˈɪntə(ɹ)ˌlaɪn// adj, verb

adj, verb ·Uncommon ·Advanced level

Verb

1
To write or insert between lines already written or printed, as for addition or correction.
"to interline a page or a book"
2
To arrange in alternate lines.
"When by this way of interlining Latin and Englisſh one with another, he has got a moderate Knowledge of the Latin Tongue, he may then be advanc'd a little farther to the reading of ſome other eaſie Latin Book, […]"
3
To imprint or mark with lines.
"For each contracted frown, / A crooked wrinkle interlines my brow: / Spend but one hour in frowns, and I shall look / Like to a beldam of one hundred years."

Adjective

1
Between lines. not-comparable
"Interline twitter occurs on interlaced displays at half the field-rate."
2
Between (or with) two airlines. not-comparable
"American Airlines and British Airways have an interline agreement to handle each other's baggage and to accept each other's tickets."

"Interline twitter occurs on interlaced displays at half the field-rate."

From inter- + line.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.