affecting a person only once.
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]
semelincident/sem·el·in·ci·dent/ (sem″el-in´sĭ-dent) attacking only once, as an infectious disease which induces immunity thereafter.
affecting an animal only once.