[1915–20; de- + ration]This word is first recorded in the period 1915–20. Other words that entered Englishat around the same time include: camouflage, collage, conditioning, costar, stockpilede- is a prefix occurring in loanwords from Latin (decide); also used to indicate privation, removal, and separation (dehumidify), negation (demerit; derange), descent (degrade; deduce), reversal (detract), or intensity (decompound)