chiefly

[cheef-lee]
adverb
1.
primarily; essentially: He phoned chiefly to let us know he was feeling better.
2.
mainly; mostly: This dish consists chiefly of noodles.
adjective
3.
of, pertaining to, or like a chief: his chiefly responsibilities.

Origin:
1300–50; Middle English; see chief, -ly


1, 2. See especially.
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World English Dictionary
chiefly (ˈtʃiːflɪ)
 
adv
1.  especially or essentially; above all
2.  in general; mainly; mostly
 
adj
3.  of or relating to a chief or chieftain

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

chiefly
"pre-eminently," mid-14c., from chief (q.v.). Meaning "pertaining to a chief" is from 1870.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Their goal: to draft an agreement that will limit global warming, chiefly by
  reducing greenhouse gas emissions.
The font will be chiefly used by teenagers who take on the honor of baptizing
  ancestors.
Most cases are diagnosed after birth now, but if the blood test is widely
  adopted it could become chiefly a prenatal event.
The latest scores are chiefly based on results from the last three model years.
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