Usually means: Essential support in critical situations.
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We found 23 dictionaries that define the word lifeline:

General (21 matching dictionaries)
  1. lifeline: Longman Dictionary of Contemporary English
  2. lifeline: Merriam-Webster
  3. lifeline: Oxford Learner's Dictionaries
  4. lifeline: American Heritage Dictionary of the English Language
  5. lifeline: Collins English Dictionary
  6. lifeline: Vocabulary.com
  7. Lifeline, lifeline: Wordnik
  8. lifeline: Cambridge Advanced Learner's Dictionary
  9. lifeline: Wiktionary
  10. lifeline: Webster's New World College Dictionary, 4th Ed.
  11. lifeline: The Wordsmyth English Dictionary-Thesaurus
  12. lifeline: Infoplease Dictionary
  13. lifeline: Dictionary.com
  14. lifeline: Cambridge Essential American English Dictionary
  15. LifeLine (medical transport), Lifeline (Ben Harper album), Lifeline (Brooke Fraser song), Lifeline (Crisis Support Service), Lifeline (EP), Lifeline (FCC program), Lifeline (G.I. Joe), Lifeline (Iris DeMent album), Lifeline (Jamiroquai song), Lifeline (Neal Morse album), Lifeline (Pablo Cruise album), Lifeline (Papa Roach song), Lifeline (Roy Ayers album), Lifeline (Spandau Ballet song), Lifeline (Stargate Atlantis), Lifeline (TV series), Lifeline (album), Lifeline (crisis support service), Lifeline (diving), Lifeline (film), Lifeline (safety), Lifeline (ship), Lifeline (video game), Lifeline (web series), Lifeline: Wikipedia, the Free Encyclopedia
  16. lifeline: Rhymezone
  17. lifeline: FreeDictionary.org
  18. lifeline: Mnemonic Dictionary
  19. lifeline: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. lifeline: Encyclopedia

Slang (1 matching dictionary)
  1. Lifeline: Urban Dictionary

(Note: See lifelines as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  A line to which a drowning or falling victim may cling.
noun:  (by extension) A source of salvation in a crisis.
noun:  A means or route for transporting indispensable supplies.
noun:  (engineering) A system or structure of vital importance to a community.
noun:  (nautical) On the deck of a boat, a line to which one can attach oneself to stay aboard on rough seas.
noun:  (underwater diving) A line from the diver to a tender at the surface control point.
noun:  (palmistry) A particular crease in the palm.

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