( BrE also ma·teri·al·ise ) / məˈtɪəriəlaɪz; NAmE -ˈtɪr-/ verb [ v ]
1.
(usually used in negative sentences) to take place or start to exist as expected or planned :
The promotion he had been promised failed to materialize.
2.
to appear suddenly and/or in a way that cannot be explained :
A tall figure suddenly materialized at her side.
( informal )
The train failed to materialize (= it did not come) .
► ma·teri·al·iza·tion , ma·teri·al·isa·tion / məˌtɪəriəlaɪˈzeɪʃn; NAmE -ˌtɪriələˈz-/ noun [ U ]