Definition of "kirk"

When she sang in the kirk, folk have told me that they had a foretaste of the musick of the New Jerusalem, and when she came in by the village of Caulds old men stottered to their doors to look at her.

1902, John Buchan, The Outgoing of the Tide

But long, long ago an enthusiastic reporter called it a "fairy palace," and the office building on the west side was once a church. Hence, in North British phraseology, to "gang tae the Kirk" meant to be had up on the carpet.

1941 January, C. Hamilton Ellis, “The Scottish Station”, in Railway Magazine, page 3