Institute of Radio Engineers. Units of measurement dividing the area from the bottom of sync to peak white level into 140 equal units. 140 IRE equals 1Vpp. The range of active video is 100 IRE.
Found on http://www.zoo.co.uk/~z0001325/Glossary.html
ire 1. Belligerence aroused by a real or supposed wrong (personified as one of the deadly sins). 2. A feeling that is oriented toward some real or supposed grievance. 3. A strong emotion or anger. 4. Intense anger; wrath. 5. Anger; wrath; keen resentment; a word chiefly used in poetry. Found on http://www.wordinfo.info/words/index/info/view_unit/1087/
[unit] An IRE is a unit used in the measurement of composite video signals. Its name is derived from the initials of the Institute of Radio Engineers. A value of 100 IRE was originally defined to be the range from black to white in a video signal. A value of 0 IRE corresponds to the voltage value of the signal during the blanking period. Th... Found on http://en.wikipedia.org/wiki/IRE_(unit)