British Dictionary definitions for nonprovisionary
subject to later alteration; temporary or conditional: a provisional decision
a postage stamp surcharged during an emergency to alter the stamp's denomination or significance until a new or regular issue is printed
of, designating, or relating to the unofficial factions of the IRA and Sinn Féin that became increasingly dominant following a split in 1969. The Provisional movement remained committed to a policy of terrorism until its ceasefires of the mid-1990s
Also called Provo. a member of the Provisional IRA or Sinn Féin
"as a temporary arrangement for the present," c.1600, from provision (n.) + -al (1), or else from Middle French provisionnal (15c.), from Old French provision. The notion is of something that will "provide for present needs." Related: Provisionally.