a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return; "sonar is an acronym for sound navigation ranging"; "asdic is an acronym for antisubmarine detection investigation committee"
the Hindu or Buddhist doctrine that person may be reborn successively into one of five classes of living beings (god or human or animal or hungry ghost or denizen of hell) depending on the person's own actions
a second or new birth
embodiment in a new form (especially the reappearance or a person in another form); "his reincarnation as a lion"