IPA: /ˈmɑːrdʒɪnəli/
KK: /ˈmɑrdʒɪnəli/
In a way that is only slightly or barely enough; not significantly.
The changes to the policy will marginally improve the situation.
Marginally → It is formed from "marginal" (from Latin "marginalis", meaning of or pertaining to a margin) and the suffix "-ly" (meaning in a manner of). The word "marginally" means in a manner relating to the margin or edge, often implying a small or insignificant amount.
Think of something being at the 'edge' or 'margin' — 'marginal' relates to the margin, and '-ly' indicates the manner. So, marginally means in a manner that is at the edge or small.