Usually means: Primary routes or methods used.
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We found 11 dictionaries that define the word mainlines:

General (8 matching dictionaries)
  1. mainlines: Merriam-Webster
  2. mainlines: Collins English Dictionary
  3. mainlines: Vocabulary.com
  4. mainlines: Wordnik
  5. mainlines: Cambridge Advanced Learner's Dictionary
  6. mainlines: Wiktionary
  7. mainlines: Dictionary.com
  8. mainlines: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. mainlines: Encyclopedia

Medicine (2 matching dictionaries)
  1. mainlines: Merriam-Webster Medical Dictionary
  2. mainlines: Medical dictionary

(Note: See mainline as well.)

Definitions from Wiktionary (mainline)

adjective:  Normal, principal or standard.
adjective:  (rail transport) Of or pertaining to the principal route or line of a railway.
adjective:  (rail transport) Of or pertaining to a surface railway as distinct from an underground, elevated or light rail one.
adjective:  (chess) Of a sequence of opening moves: being part of a main line ("a standard sequence of opening moves considered to be best play").
verb:  (slang) To inject (a drug) directly into a vein.
verb:  (by extension, informal, transitive) To consume voraciously.
verb:  (computing, transitive) To integrate (code, etc.) into the main repository for a software project, rather than separate forks.
verb:  (transitive) To include (a prisoner) in the general population of a prison.
noun:  (aviation) An airline's main operating unit, as opposed to codeshares or regional subsidiaries.
noun:  (rail transport) The principal route or line of a railway.
noun:  (fishing) In longline fishing the central line to which the branch lines with baits are attached.
noun:  (plumbing) The pipeline carrying wastewater to the public drains or a septic tank.
noun:  (slang) A principal vein into which a drug can be injected.
noun:  (computing) The main repository for a software project, from which different versions (forks) may be split off.
noun:  The general population of a prison.
noun:  (chess) Alternative form of main line [(chess) A standard sequence of opening moves considered to be best play.]
▸ Also see mainline





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