1670s, "disposition to petty sects in opposition to things established" [Johnson]; see sectarian + -ism.
he condemned religious sectarianism
secretive
secretly
secretory
sect
sectarian
sectarianism
sectary
section
sectional
sectionalism
sector
)window.location='https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=byronic106@yahoo.com&lc=US&item_name=Donation+to +Help+Keep+Etymonline+Free+and+Open&no_note=0&cn=&curency_code=USD&bn=PP-DonationsBF:btn_donateCC_LG.gif:NonHosted'){kind=link}