Definition of "all the while"

all the while

adverb
not comparable
1. (idiomatic) At the same time as, usually over an extended period.
  Quotations
  The good fortune which attended him throughout life may have been partly owing to this cause as well as to his undoubted valour, for though he never lost a battle, nothing is more astounding than his imprudence and the easy confidence with which he trusted Somerset, Warwick, Montague, and others, all the while they were betraying him.
  1889, Leslie Stephen, Dictionary of National Biography, page 82
  Sulla, encamped near Scipio, and amusing him with caresses under pretence of an approaching peace, was all the while corrupting his troops.
  1891, Plutarchus, Plutarch's Lives, page 8
  And all with that vital piece of evidence burning a hole in his pocket the while!
  1986, Michael Dibdin, A Rich Full Death, page 60
  All the while, my intention was to amuse her, and divert her out of her hellish thoughts, and show to her the wide world of which she could now be a part.
  1991, Anne Rice, The Witching Hour, page 281