partisan

1 partisan /ˈpɑɚtəzən/ Brit /ˌpɑːtəˈzæn/ noun
plural partisans
1 partisan
/ˈpɑɚtəzən/ Brit /ˌpɑːtəˈzæn/
noun
plural partisans
Britannica Dictionary definition of PARTISAN
[count]
1 
: a person who strongly supports a particular leader, group, or cause
2 
: a member of a military group that fights against soldiers who have taken control of its country

— partisanship

/ˈpɑɚtɚzənˌʃɪp/ Brit /ˌpɑːtəˈzænʃɪp/ noun [noncount]
2 partisan /ˈpɑɚtəzən/ Brit /ˌpɑːtəˈzæn/ adjective
2 partisan
/ˈpɑɚtəzən/ Brit /ˌpɑːtəˈzæn/
adjective
Britannica Dictionary definition of PARTISAN
[more partisan; most partisan] often disapproving
: strongly supporting one leader, group, or cause over another
— compare bipartisan, nonpartisan