| DIR | a report of the exact words used in a discourse (e.g., "he said `I am a fool'") |
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| DIR | a union of two disjoint sets in which every element is the sum of an element from each of the disjoint sets |
| DIR | a mission requiring one force to support another specific force and authorizing it to answer directly the supported force's request for assistance |
| DIR | fire delivered in support of part of a force (as opposed to general supporting fire delivered in support of the force as a whole) |
| DIR | a tax paid directly by the person or organization on whom it is levied |
| DIR | the occurrence of high tide on one side of the earth coinciding with high tide on the opposite side |
| DIR | a trust created by the free and deliberate act of the parties involved (usually on the basis of written documentation) |
| DIR | (United Kingdom) formerly a school that charged tuition fees and also received government grants in return for admitting certain non-paying students who were nominated by the local authorities |
| DIR | manageable by a supervising agent |
| DIR | having a specified direction |
| DIR | a verdict entered by the court in a jury trial without consideration by the jury |
| DIR | showing the way by conducting or leading |