Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • abbreviation executive order

from The Century Dictionary.

  • noun In petrography, specifically, a prefix used before the names of rocks, chiefly volcanic, to indicate that they were erupted in geologically ancient time as distinguished from Tertiary or recent time.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • initialism Equal Opportunity
  • initialism Education Otherwise - a home education charity in the UK

Etymologies

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Examples

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