Longman Dictionary of Contemporary English homepage

marginal

adjective
     
mar‧gin‧al
1 a marginal change or difference is too small to be important:
a marginal increase in the unemployment figures
a marginal improvement in profits
2 technical relating to a change in cost, value etc when one more thing is produced, one more dollar is earned etc:
marginal revenue
3

marginal seat/constituency

British EnglishPPV a seat in a parliament or similar institution, which can be won or lost by a small number of votes
4 marginal people or groups not are considered powerful or important [≠ mainstream]:
The album contains too many songs by marginal bands.
5 [only before noun] written in a margin:
marginal notes

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