Usually means: Loose, excess, or unused capacity.
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We found 46 dictionaries that define the word slack:

General (25 matching dictionaries)
  1. slack: Merriam-Webster.com
  2. slack, slack: Oxford Learner's Dictionaries
  3. slack, slack, slack: American Heritage Dictionary of the English Language
  4. slack: Collins English Dictionary
  5. slack: Vocabulary.com
  6. Slack, slack: Wordnik
  7. slack: Cambridge Advanced Learner's Dictionary
  8. Slack, slack: Wiktionary
  9. slack: Webster's New World College Dictionary, 4th Ed.
  10. slack: The Wordsmyth English Dictionary-Thesaurus
  11. slack: Infoplease Dictionary
  12. slack: Dictionary.com
  13. slack (adj.), slack (n.): Online Etymology Dictionary
  14. slack: Cambridge Essential American English Dictionary
  15. Slack (project management), Slack (river), Slack (software), Slack: Wikipedia, the Free Encyclopedia
  16. Slack: Online Plain Text English Dictionary
  17. slack: Webster's Revised Unabridged, 1913 Edition
  18. slack: Rhymezone
  19. slack: AllWords.com Multi-Lingual Dictionary
  20. slack: Webster's 1828 Dictionary
  21. slack: Free Dictionary
  22. slack: Mnemonic Dictionary
  23. slack: Dictionary/thesaurus

Art (3 matching dictionaries)
  1. Epicurus.com Coffee Glossary (No longer online)
  2. Shakespeare Glossary (No longer online)
  3. SLACK: Bobs Byway OF POETIC TERMS

Business (5 matching dictionaries)
  1. MoneyGlossary.com (No longer online)
  2. Construction Term Glossary (No longer online)
  3. Slack: Wideman Comparative Glossary of Project Management Terms
  4. slack: Legal dictionary
  5. BusinessDictionary.com (No longer online)

Computing (2 matching dictionaries)
  1. slack: Free On-line Dictionary of Computing
  2. slack: Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. slack: Medical dictionary

Miscellaneous (1 matching dictionary)
  1. slack: Idioms

Science (1 matching dictionary)
  1. slack: PlanetMath Encyclopedia

Slang (2 matching dictionaries)
  1. slack, slack, slack, slack: Green’s Dictionary of Slang
  2. Slack: Urban Dictionary

Tech (5 matching dictionaries)
  1. AUTOMOTIVE TERMS (No longer online)
  2. Glossary of Coal Mining Terms (No longer online)
  3. SLACK: Glossary of Nautical Terms
  4. SeaTalk Dictionary of English Nautical Language (No longer online)
  5. Slack: Latitude Mexico

(Note: See slacked as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (uncountable) The part of anything that hangs loose, having no strain upon it.
noun:  (countable) A tidal marsh or shallow that periodically fills and drains.
noun:  (uncountable, psychotherapy) Unconditional listening attention given by client to patient.
adjective:  (normally said of a rope) Lax; not tense; not firmly extended.
adjective:  Weak; not holding fast.
adjective:  Moderate in some capacity.
adjective:  Moderately warm.
adjective:  Moderate in speed.
adjective:  Lacking diligence or care; not earnest or eager.
adjective:  Not active or busy, successful, or violent.
adjective:  Excess; surplus to requirements.
adjective:  (slang, Caribbean, Jamaica) Vulgar; sexually explicit, especially in dancehall music.
adjective:  (linguistics) Lax.
adverb:  Slackly.
verb:  (transitive, intransitive) To slacken.
verb:  (obsolete) To mitigate; to reduce the strength of.
verb:  To lose cohesion or solidity by a chemical combination with water; to slake.
verb:  To refuse to work as hard as one is supposed to.
noun:  (rail transport) A temporary speed restriction where track maintenance or engineering work is being carried out at a particular place.
noun:  (countable) A valley, or small, shallow dell; a sag or saddle in a ridge.
noun:  A flat-bottomed, hollow zone within a sand-dune system that has developed over impervious strata, sometimes due to erosion or blow-out of the dune system; its flat base level is therefore close to or at the permanent water-table level, and therefore has rich, marshy flora, with Salix species (willows) as typical woody colonisers.
noun:  (mining) Small coal; coal dust.
noun:  A surname.

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