Definition of "minimart"

The joke is that these two men are sitting in front of a gas station that has been transformed into a minimart capable of supplying anything—even the kosher pickled herring requested by an Orthodox Jew.

1988 July 15, Tom Valeo, “Happy Happy Good Show”, in Chicago Reader‎

I went to the minimart…It’s about a fifteen minute walk both ways. But I didn’t wanna drive cause I was really wasted.

2016, Kenneth Lonergan, Manchester by the Sea, spoken by Lee Chandler (Casey Affleck)