I just looked it up and MW’s definition of “missing” is “absent” or “lost” or “needed or expected but not included”. Dictionary.com says “absent, not found, or lost” and “lacking”. Wiktionary says “Not able to be located; gone, misplaced”, “Not present when it (they) should be”, and “Of an internal combustion engine: running roughly due to an occasional lack of a spark or other irregular fault.”
What dictionary are you using?
I just looked it up and MW’s definition of “missing” is “absent” or “lost” or “needed or expected but not included”. Dictionary.com says “absent, not found, or lost” and “lacking”. Wiktionary says “Not able to be located; gone, misplaced”, “Not present when it (they) should be”, and “Of an internal combustion engine: running roughly due to an occasional lack of a spark or other irregular fault.”