Definition of "centre"

So after a short spell in the brass foundry the wisest course was to follow with a similar period in the steel foundry, where much important work was done, including the manufacture of centres for wheels.

1944 November and December, A Former Pupil, “Some Memories of Crewe Works—II”, in Railway Magazine, page 343

One controversy which has not had an airing in discussion of the new Transport Bill is that centring on the status of the Pullman Car Co.

1962 February, “Talking of Trains: The "Midland Pullman"”, in Modern Railways, page 77