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.
- stereologic
- stereological
- stereologically
- stereologist
- stereology
- stereomicroscope
- stereomicroscopic
- stereomicroscopy
- stereophonic
- stereophonically
- stereophony
- stereopsis
- stereopticon
- stereoscope
- stereoscopic
- stereoscopically
- stereoscopist
- stereoscopy
- stereotactic
- stereotactical
- stereotactically
- stereotactic radiosurgery
- stereotaxic
- stereotaxical
- stereotaxically