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MTTR is an abbreviation that has several different expansions with greatly differing meanings. It is wise to spell out exactly what is meant when using it, rather than assuming the reader will know which is being used.

The M can stand for any of minimum, mean or maximum, and the R can stand for any of recovery, repair, respond, or restore. The most common, mean, is also subject to interpretation, as there are several ways to calculate a mean.

In an engineering context with no explicit definition, the engineering figure of merit, mean time to repair would be the most probable intent by virtue of seniority of usage. It is also similar in meaning to the others above (more in the case of recovery, less in the case of respond, the latter being more properly styled mean "response time").