Garrisonian UK /ˌɡæɹɪˈsəʊ.ni.ən/US /ˌɡæɹɪˈsoʊ.ni.ən/adjective 1noun 1forms 3 adjective1 •Of or pertaining to William Lloyd Garrison (1805–1879), American abolitionist, journalist, and social reformer. noun1 •A supporter of William Lloyd Garrison's ideas. formsGarrisonians · more Garrisonian · most Garrisonian