Plain English Meaning
An instrument approach that uses a precise side-to-side guidance signal to bring you close to the airport, but the signal does not point straight down the runway. You fly the course toward the airport, then maneuver visually to land.
Full Definition
Instrument approach procedures that use a Localizer-type Directional Aid for lateral guidance. An LDA provides course guidance similar in accuracy to an ILS localizer, but the course is not aligned with the runway centerline. When the offset from runway centerline is 30 degrees or less and the procedure includes straight-in minimums, a straight-in landing may be authorized; otherwise, only are published. Some LDA approaches include guidance, but most do not.