GC: n

S: http://www.wisegeek.com/what-is-personnel-training.htm#didyouknowout (last access: 2 September 2014); http://persmin.gov.in/otraining/Index.aspx (last access: 2 September 2014).

N: mid-15c., «protraction, delay,» verbal noun from train (v.). From 1540s as «discipline and instruction to develop powers or skills;» 1786 as «exercise to improve bodily vigor.» Training wheels as an attachment to a bicycle is from 1953.

N: OED – http://www.etymonline.com/index.php?allowed_in_frame=0&search=training&searchmode=none (last access: 5 September 2014)

SYN:
S: