The term is not antiquated.
Brokered convention
In United States politics, a brokered convention is a situation in which no single candidate has secured a pre-existing majority of delegates (whether those selected by primary elections and caucuses, or superdelegates) prior to the first official vote for a political party’s presidential candidate at its nominating convention.
(Definition from Bing.)
Yes, that is the common usage, but it is none the less inaccurate.