semelincident

semelincident

 [sem″el-in´sĭ-dent] affecting a person only once.

sem·el·in·ci·dent

(sem'el-in'si-dent), An obsolete term that means happening only once; said of an infectious disease, one attack of which confers permanent immunity. [L. semel, once, + incido, to happen, fr. cado, to fall]