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READ THESE ARTICLES# Definition of *matroid* in English:

## matroid

### noun

MathematicsA mathematical entity consisting of a finite set E together with a collection ℐ of subsets of E such that (i) the empty set is a member of ℐ, (ii) any subset of a member of ℐ is also a member of ℐ, and (iii) if two subsets I ₁ and I ₂ are in ℐ, where the cardinality of I ₁ is less than that of I ₂, then there exists an element e that is in I ₂ but not I ₁ such that the union of I ₁ with { e } is also an element of ℐ.

**Origin**

1930s. From matr- + -oid.

**Pronunciation**

**matroid**

/ˈmeɪtrɔɪd/ Are You Learning English? Here Are Our Top English Tips