When I saw members of the board using two spellings for selvedge/selvage, I had to know which was correct and discovered that one is the British spelling and the other the American spelling. No better place than Wikipedia to find out more, so here is what I discovered. Based on this information and what has worked in the past for me, I will continue to leave the selvedge/selvage on after I have cut strips until I get ready to sew.
froggyintexas
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The selvage (US English) or selvedge (British English) is the term for the self-finished edges of fabric. The selvages keep the fabric from unraveling or fraying.[1][2] The selvages are a result of how the fabric is created. In woven fabric, selvages are the edges that run parallel to the warp (the longitudinal threads that run the entire length of the fabric), and are created by the weft thread looping back at the end of each row. In knitted fabrics, selvages are the unfinished yet structurally sound edges that were neither cast on nor bound off.[3][4] Historically, the term selvage applied only to loom woven fabric, though now can be applied to flat-knitted fabric.
The terms selvage and selvedge are a corruption of "self-edge", and have been in use since the 16th century