sem·i·cen·ten·ni·al 
(sĕm′ē-sĕn-tĕnē-əl, sĕm′ī-)
(sĕm′ē-sĕn-tĕnē-əl, sĕm′ī-)adj.
Marking the 50th anniversary of an event.
n.
A 50th anniversary or its celebration.
- immune response
- immune serum globulin
- immune system
- immunity
- immunization
- immunize
- immuno-
- immunoassay
- immunoblot
- immunochemical
- immunochemically
- immunochemistry
- immunocompetence
- immunocompetent
- immunocompromised
- immunodeficiency
- immunodeficient
- immunodepressant
- immunodepression
- immunodepressive
- immunodiagnosis
- immunodiagnostic
- immunoelectrophoresis
- immunofluorescence
- immunofluorescent