Meaning of passive immunity,

pas'sive immu'nity

Pronunciation: [key]
— Immunol. Immunol.
  1. immunity resulting from the injection of antibodies or sensitized lymphocytes from another organism or, in infants, from the transfer of antibodies through the placenta or from colostrum.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.