so small it barely makes a difference

marginal

adjective|/ˈmɑːr.dʒɪn.əl/

Small and not very important or significant; at the edge or border.

Examples

In a meeting

The cost savings from that change would be marginal at best.

Over coffee

The difference in taste between the two brands is marginal.

Why this word

small

Marginal specifically means barely significant or at the edge of acceptability, while small just indicates size

minor

Marginal emphasizes borderline significance or minimal impact, while minor means less important without implying threshold status

slight

Marginal suggests barely meeting criteria or being on the edge, while slight simply means not much

Usage tip

In business, 'marginal improvement' means barely noticeable. In economics, 'marginal cost' means the cost of producing one more unit.

Etymology

Latin marginalis — margo (edge, border)

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