diff --git a/docs/release_notes/issue1134-geosegment-definition.md b/docs/release_notes/issue1134-geosegment-definition.md
new file mode 100644
index 00000000..3eb6f364
--- /dev/null
+++ b/docs/release_notes/issue1134-geosegment-definition.md
@@ -0,0 +1 @@
+Fix definition of GeoSegment to say it is a portion of the GeoRoute (not a portion of a GeoRegion).
diff --git a/ontologies/gistCore.ttl b/ontologies/gistCore.ttl
index 0671cf72..40391632 100644
--- a/ontologies/gistCore.ttl
+++ b/ontologies/gistCore.ttl
@@ -778,6 +778,7 @@ gist:GeoRoute
 	] ;
 	skos:definition "An ordered set of GeoPoints that defines a path from starting point to ending point."^^xsd:string ;
 	skos:prefLabel "Geo Route"^^xsd:string ;
+	skos:scopeNote "Each pair of consecutive GeoPoints in a GeoRoute is a GeoSegment."^^xsd:string ;
 	.
 
 gist:GeoSegment
@@ -800,8 +801,9 @@ gist:GeoSegment
 			]
 		) ;
 	] ;
-	skos:definition "A single portion of a GeoRegion which has been divided (i.e., segmented)."^^xsd:string ;
+	skos:definition "A single portion of a GeoRoute consisting of a pair of consecutive GeoPoints which belong to it."^^xsd:string ;
 	skos:prefLabel "Geo Segment"^^xsd:string ;
+	skos:scopeNote "A GeoSegment is also a GeoRoute (a short one)."^^xsd:string ;
 	.
 
 gist:GeoVolume