diff --git a/src/cco-modules/TimeOntology.ttl b/src/cco-modules/TimeOntology.ttl
index 6adebf5..37b6932 100644
--- a/src/cco-modules/TimeOntology.ttl
+++ b/src/cco-modules/TimeOntology.ttl
@@ -226,7 +226,7 @@ cco:ont00001923 rdf:type owl:ObjectProperty ;
                  rdfs:domain obo:BFO_0000038 ;
                  rdfs:range obo:BFO_0000038 ;
                  rdfs:label "interval starts"@en ;
-                 skos:definition "A Temporal Interval INT1 starts some Temporal Interval INT2 iff there exist Temporal Instants inst1, inst2, and inst3 such that inst1 is the starting instant of both INT1 and INT2, inst2 is the ending instant of INT1, inst3 is the ending instant of INT2 and inst2 is before inst3."@en ;
+                 skos:definition "x interval_starts y iff x and y are both instances of One Dimensional Temporal Region and there exist instances of Zero Dimensional Temporal Region v, w, and z such that v is the starting instant of both x and y, w is the ending instant of x, z is the ending instant of y and w is before z."@en ;
                  cco:ont00001754 "J. F. Allen and J. A. G. M. Koomen. Planning using a temporal world model. In Proceedings of the 8th International Joint Conference on Artificial Intelligence (IJCAI-1983)  pages 741–747. Available at: https://www.ijcai.org/Proceedings/83-2/Papers/036.pdf"@en ;
                  cco:ont00001760 "https://www.commoncoreontologies.org/TimeOntology"^^xsd:anyURI .