First Baron Passfield first·ba·ron·passfield uncommon noun 1. English sociologist and economist and a central member of the Fabian Society (1859-1947) SynonymsWebbSidney WebbSidney James WebbFirst Baron Passfield Related words Broader terms sociologisteconomist Parts Fabian Society WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.