/ ˌpɑːtɪˈzæn; ˈpɑːtɪzæn; NAmE ˈpɑːrtəzn/ adjective , noun
■ adjective
(often disapproving ) showing too much support for one person, group or idea, especially without considering it carefully
SYN one-sided :
Most newspapers are politically partisan.
■ noun
1.
a person who strongly supports a particular leader, group or idea
SYN follower
2.
a member of an armed group that is fighting secretly against enemy soldiers who have taken control of its country
► par·ti·san·ship / -ʃɪp; NAmE / noun [ U ]
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WORD ORIGIN
mid 16th cent.: from French , via Italian dialect from Italian partigiano , from parte part (from Latin pars , part- ).