Source : Webster's Revised Unabridged Dictionary (1913)

Every \Ev"er*y\, a. & a. pron. [OE. everich, everilk; AS. ?fre
   ever + [ae]lc each. See {Ever}, {each}.]
   1. All the parts which compose a whole collection or
      aggregate number, considered in their individuality, all
      taken separately one by one, out of an indefinite bumber.

            Every man at his best state is altogether vanity.
                                                  --Ps. xxxix.
                                                  5.

            Every door and window was adorned with wreaths of
            flowers.                              --Macaulay.

   2. Every one. Cf. {Each}. [Obs.] ``Every of your wishes.''
      --Shak.

            Daily occasions given to every of us. --Hooker.

   {Every each}, every one. [Obs.] ``Every each of them hath
      some vices.'' --Burton..

   {Every now and then}, at short intervals; occasionally;
      repeatedly; frequently. [Colloq.]

   Note: Every may, by way of emphasis, precede the article the
         with a superlative adjective; as, every, the least
         variation. --Locke.

   Syn: {Every}, {Each}, {Any}.

   Usage: Any denotes one, or some, taken indifferently from the
          individuals which compose a class. Every differs from
          each in giving less promonence to the selection of the
          individual. Each relates to two or more individuals of
          a class. It refers definitely to every one of them,
          denoting that they are considered separately, one by
          one, all being included; as, each soldier was
          receiving a dollar per day. Every relates to more than
          two and brings into greater prominence the notion that
          not one of all considered is excepted; as, every
          soldier was on service, except the cavalry, that is,
          all the soldiers, etc.

                In each division there were four pentecosties,
                in every pentecosty four enomoties, and of each
                enomoty there fought in the front rank four
                [soldiers].                       --Jowett
                                                  (Thucyd. ).

                If society is to be kept together and the
                children of Adam to be saved from setting up
                each for himself with every one else his foe.
                                                  --J. H.
                                                  Newman.

Source : WordNet®

every now and then
     adv : occasionally; "every so often she visits her father" [syn: {every
           so often}]