Definition of Out of commission

Babylon English Dictionary
not in working condition, out of order
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Out of commission Definition from Language, Idioms & Slang Dictionaries & Glossaries
hEnglish - advanced version

out of commission
adj : not available for service [ant: in commission]

ENGLISH IDIOMS 2.EDITION
not operating, out of order My brain is out of commisssion. I can't think today.
English Idioms WM 1.3a
not operating, out of order 
My brain is out of commission. I can't think today.
WordNet 2.0

Adjective
1. not available for service
(antonym) in commission
(similar) retired, out of service