reliability　

reliability　可靠性，可靠程度　

1.the ability of an apparatus，machine，or system to consistently perform its intended or required function or mission，on demand and without degradation or failure.2.manufacturing：the probability of failure-free performance over an item’s useful life，or a specified timeframe，under specified environmental and duty-cycle conditions.Often expressed as mean time between failures（MTBF）or reliability coefficient.Also called quality over time.See also availability.3.consistency and validity of test results determined through statistical methods after repeated trials.