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The context of a due date originated in journalism, probably from an earlier usage in printing, representing a guideline marked on a plate for a printing press (inside which all content should appear). According to the Oxford English Dictionary, early usage refers simply to lines that do not move, such as one used in angling; slightly later American usage includes a boundary around a prison which prisoners must not cross.


deadline ‎(plural deadlines)

  1. A date on or before which something must be completed.
    I must make this deadline or my boss will kill me!
  2. (archaic) A guideline marked on a plate for a printing press.
  3. (archaic) A line that does not move.
  4. (archaic) A boundary around a prison, prisoners crossing which would be shot.



deadline ‎(third-person singular simple present deadlines, present participle deadlining, simple past and past participle deadlined)

  1. (military) To render an item non-mission-capable; to ground an aircraft, etc.



< English




  1. (colloquial) deadline


The declension of this word is problematic. Joukahainen recommends nalle-type declension, presumably based on the spelling of the word:

Inflection of deadline (Kotus type 8/nalle, no gradation)
nominative deadline deadlinet
genitive deadlinen deadlinejen
partitive deadlineä deadlinejä
illative deadlineen deadlineihin
singular plural
nominative deadline deadlinet
accusative nom. deadline deadlinet
gen. deadlinen
genitive deadlinen deadlinejen
partitive deadlineä deadlinejä
inessive deadlinessä deadlineissä
elative deadlinestä deadlineistä
illative deadlineen deadlineihin
adessive deadlinellä deadlineillä
ablative deadlineltä deadlineiltä
allative deadlinelle deadlineille
essive deadlinenä deadlineinä
translative deadlineksi deadlineiksi
instructive deadlinein
abessive deadlinettä deadlineittä
comitative deadlineineen

On the other hand, nalle-declension does not fit with the pronunciation, which would rather indicate risti-type declension. It would probably be advisable to avoid using this word in written communication, and use Finnish synonyms instead.