prolongation
nounUK /ˌprəʊlɒŋˈɡeɪʃən/
US /ˌproʊlɔːŋˈɡeɪʃən/
The act of making something last longer.
The prolongation of the meeting made everyone tired.
OTHER MEANINGS
2. A part that has been added to make something longer.
The prolongation of the road reached the next town.
3. In music, the act of holding a note longer than usual.
The prolongation of the final note gave the song a dramatic ending.
4. The state of being extended in time.
The prolongation of winter surprised the farmers.