Original: Investiture, from the Latin (preposition in and  verb vestire, 'dress' from vestis 'robe') is a rather general term for the formal installation of an incumbent (heir, elect of nominee) in public office, especially by taking possession of its insignia.
Simplified: Investiturefrom the Latin preposition in and  verb vestire, 'dress' from vestis 'robe' means the formal installation of somebody (heir, elect of nominee) in public office by formally giving him the "insignia".