principally

Meanings

1. 1
   adv

   In a primary manner; pertaining to the principal of a matter.

   The game principally consists in taking and carrying off the ball from the opposite party, after being hurled into the air midway between two high pillars, which are the goasl, and the party who bears off the ball to their pillar, wins the game[…]

2. 2
   adv

   for the most part

Etymology

From Middle English principaly. By surface analysis, principal + -ly.