What is "at homes"

Usage examples of "at homes".

At least nine of those supporters registered at homes owned or occupied by family of De Goti.

I went around the country, looking at homes, hotels, all sorts of buildings.

I could remember the Moms's voice high overhead at a screen-porch door, calling us in as dusk drifted down and leaded fanlights began to light up at homes' doors in some sort of linear sync.