What is the meaning of longest?

adjective

• Primarily temporal sense; being or indicating a relatively great or greater than average duration or passage of time or a duration as specified.
  • usage: "a long life"; "a long boring speech"; "a long time"; "a long friendship"; "a long game"; "long ago"; "an hour long"
  • synonyms: long
• Primarily spatial sense; of relatively great or greater than average spatial extension or extension as specified.
  • usage: "a long road"; "a long distance"; "contained many long words"; "ten miles long"
  • synonyms: long
• Of relatively great height.
  • usage: "a race of long gaunt men- Sherwood Anderson; "looked out the long French windows"
  • synonyms: long
• Good at remembering.
  • usage: "a retentive mind"; "tenacious memory"
  • synonyms: retentive, recollective, long, tenacious
• Holding securities or commodities in expectation of a rise in prices.
  • usage: "is long on coffee"; "a long position in gold"
  • synonyms: long
• Of speech sounds or syllables. ( of relatively long duration)
  • usage: "the English vowel sounds in `bate', `beat', `bite', `boat', `boot' are long"
  • synonyms: long
• Involving substantial risk.
  • usage: "long odds"
  • synonyms: long
• Planning prudently for the future.
  • usage: "large goals that required farsighted policies"; "took a long view of the geopolitical issues"
  • synonyms: farseeing, farsighted, foresighted, foresightful, prospicient, long, longsighted
• (adj.) ()
  • synonyms: long

adverb

• For an extended time or at a distant time.
  • usage: "a promotion long overdue"; "something long hoped for"; "his name has long been forgotten"; "talked all night long"; "how long will you be gone"; "arrived long before he was expected"; "it is long after your bedtime"
  • synonyms: long
• For an extended distance.
  • synonyms: long
• For the most time.
  • usage: "she stayed longest"