long A1

/lʊŋɡ/ Measuring a large distance from one end to the other.

elongate C1

/əˈlɔŋˌɡeɪt/ To make something longer, or to become longer, by stretching or extending.

prolongation C2+

/ˌproʊlɔŋˈɡeɪʃən/ the act of extending in time or space