1
originally;essentially;naturally;by nature;really;actually
元来フットボールとは、ポロのように馬に乗って行われる競技とは違って、足で、ボールを使って行われる競技のことでした。
Football originally meant "a game played with a ball on foot" - unlike a game played on horseback, such as polo.
2
in the first place;to begin with