The phrase "a federation of five" is correct and usable in written English.
It can be used to describe a political or organizational structure consisting of five distinct entities or members that have come together for a common purpose.
Example: "The newly formed alliance is recognized as a federation of five, each representing a different region with its own unique interests."
Alternatives: "a coalition of five" or "an alliance of five".
He said that Chamber Watch, which was created by a federation of five unions called Change to Win, was simply trying to create trouble for the chamber because of its opposing political views.
Anna Burger, a top officer at the Service Employees International Union (SEIU), who also heads a federation of five unions called Change to Win, has had more face time with the president than any of the other visitors, according to the records.
Pakistan is a federation of four provinces (described above), a capital territory and federally administered tribal areas.
Yugoslavia was a federation of six nominally equal republics: Croatia, Montenegro, Serbia, Slovenia, Bosnia and Herzegovina, and Macedonia.
The United Arab Emirates is a federation of seven emirates in the southeastern corner of the Arabian Peninsula bordering Saudi Arabia.
The kingdom was replaced by a federation of six nominally equal republics: Croatia, Montenegro, Serbia, Slovenia, Bosnia and Herzegovina, and Macedonia.
The A.F.L.-C.I.O., a federation of nine million union members, has declared next Wednesday "National Call-In Day" asking workers to call their lawmakers to urge them not to tax health benefits.
Mr. Erdogan repeated the longstanding Turkish view that a future solution had to be based on a federation of two separate Cypriot states.
The Arab country, a federation of seven Persian Gulf principalities, agreed in that protocol that it would not enrich uranium or reprocess spent fuel.
The Wood View learning community is a federation of three schools: a primary, special school and secondary in a state-of-the-art campus in the north-west of the city.
From the 1680s to the 1770s the Kazakhs were involved in a series of wars with the Oyrats, a federation of four western Mongol tribes, among which the Dzungars were particularly aggressive.
