IE

American Heritage® Dictionary of the English Language, Fourth Edition

1. abbr. Indo-European
2. abbr. industrial engineer
3. abbr. industrial engineering

Century Dictionary and Cyclopedia

1. n. A common English digraph, of various origin. It occurs medially with the original power of long i, namely ē, in bield, field, wield., yield, belief, believe, bier, lief, and some other words of Anglo-Saxon origin, where it takes the place of early modern English ee, Anglo-Saxon e, y, ē, ȳ, eá, ǣ. In sieve it represents an English and Anglo-Saxon short i. It also occurs medially with the sound ē in brief, chief, grief, niece, piece, relief, relieve, reprieve, retrieve, siege, mien, and other words of French and other non-English origin, representing in most of these an early modern English ee, but an original French ie.
2. n. See -y
3. n. See -y
4. n. See -y.
5. n. An abbreviation of id est.
6. The earlier form of termination now usually written -y, of various origin (OF. -ie, -ee, -e, etc., L. -ia, -ās (-at-), -ēs (-ēd-), etc.: see -ie, -ie, -ie, -y, -y, -y, etc.), as inastronomie, familie, fancie, mercie, citie, companie, beautie, etc. The spelling -ie is retained in the plural (families, fancies, cities, etc.), and in certain diminutives, chiefly Scotch, as birdie, doggie, mousie, etc., and in diminutive personal names, as Charlie, Willie, Jennie, Annie, etc.
7. An abbreviation of Institute of Electrical Engineers (British).

Wiktionary

1. n. The ISO 3166-1 two-letter (alpha-2) code for Ireland.
2. n. Internet Explorer; any of a series of internet browsers that ship with the Microsoft Windows operating systems.
3. n. Indo-European
4. adj. Indo-European

GNU Webster's 1913

1. Abbreviation of Latin id est, that is.

WordNet 3.0

1. adv. that is to say; in other words
2. n. a commercial browser
3. adv. that is to say; in other words