The Collaborative International Dictionary of English v.0.48:

IRA \IRA\ n. (Finance)
   individual retirement account; -- a special type of savings
   account allowed by law to provide deferred taxation of the
   interest paid. [U.S., acronym]

   Syn: individual retirement account.
        [PJC]

The Collaborative International Dictionary of English v.0.48:

IRA \IRA\ n.
   The Irish Republican Army, a group in Ireland with the
   primary goal of promoting the unification of Ireland and the
   severing of the political bond of Northern Ireland with Great
   Britain, of mostly secret membership, with a militant wing
   sponsoring terrorist activities such as bombings and the
   killings of police, British soldiers, and Unionist
   sympathizers in Northern Ireland. [Acronym]
   [PJC]

WordNet (r) 3.0 (2006):

IRA
    n 1: a militant organization of Irish nationalists who used
         terrorism and guerilla warfare in an effort to drive
         British forces from Northern Ireland and achieve a united
         independent Ireland [syn: Irish Republican Army, IRA,
         Provisional Irish Republican Army, Provisional IRA,
         Provos]
    2: a retirement plan that allows you to contribute a limited
       yearly sum toward your retirement; taxes on the interest
       earned in the account are deferred [syn: individual
       retirement account, IRA]
    3: belligerence aroused by a real or supposed wrong (personified
       as one of the deadly sins) [syn: wrath, anger, ire,
       ira]

Easton's 1897 Bible Dictionary:

Ira
   citizen; wakeful. (1.) A Tekoite, one of David's thirty warriors
   (2 Sam. 23:26).

     (2.) An Ithrite, also one of David's heroes (2 Sam. 23:38).

     (3.) A Jairite and priest, a royal chaplain (2 Sam. 20:26) or
   confidential adviser (comp. 2 Sam. 8:18; 1 Chr. 18:17).


Hitchcock's Bible Names Dictionary (late 1800's):

Ira, watchman; making bare; pouring out