| LIF | a raft to use if a ship must be abandoned in an emergency |
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| LIF | a life preserver in the form of a ring of buoyant material |
| LIF | (trade mark) a candy shaped like a small lifesaver |
| LIF | any of the branches of natural science dealing with the structure and behavior of living organisms |
| LIF | a scientist who studies living organisms |
| LIF | an account of the series of events making up a person's life |
| LIF | a manner of living that reflects the person's values and attitudes |
| LIF | medical equipment that assists or replaces important bodily functions and so enables a patient to live who otherwise might not survive |
| LIF | equipment that makes life possible in otherwise deadly environmental conditions |
| LIF | a tenant whose legal right to retain possession of buildings or lands lasts as long as they (or some other person) lives |
| LIF | life preserver consisting of a sleeveless jacket of buoyant or inflatable design |
| LIF | vitally important |