mainly
adv.-
1 mostly or chiefly (adv.) B1 Intermediatemostly; used to talk about the most important part of something or the most common situation.
principally or for the most part; used to identify the primary factor, reason, or constituent in a set.
ExampleThe crowd at the music festival was mainly made up of teenagers.
ExampleThe local economy relies mainly on seasonal tourism, which leaves many residents seeking alternative employment during the winter months.
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2 forcefully (adv.) C2 Proficiency Archaicwith great strength or power.
with great force, vigour, or intensity.
ExampleThe knights fought mainly against the invaders to protect their land.
ExampleIn the ancient chronicles, the hero is described as striking mainly at his foes until the shield itself shattered under the pressure.
UsageIn modern English, this sense has been entirely replaced by 'forcefully' or 'vigorously'.
From Middle English maynly; equivalent to main + -ly.