diff --git a/src/cco-extensions/ModalRelationOntology.ttl b/src/cco-extensions/ModalRelationOntology.ttl
index 1babc92..2194b21 100644
--- a/src/cco-extensions/ModalRelationOntology.ttl
+++ b/src/cco-extensions/ModalRelationOntology.ttl
@@ -578,7 +578,7 @@ mro:BFO_0000199 rdf:type owl:ObjectProperty ;
                 rdfs:range obo:BFO_0000008 ;
                 <http://purl.org/dc/elements/1.1/identifier> "132-BFO" ;
                 rdfs:label "occupies temporal region"@en ;
-                <http://www.w3.org/2004/02/skos/core#definition> "p occupies temporal region t =Def p is a process or process boundary & the spatiotemporal region occupied by p temporally projects onto t"@en ;
+                <http://www.w3.org/2004/02/skos/core#definition> "x occupies_temporal_region y iff x is an instance of process or process boundary and y is an instance of temporal region and the spatiotemporal region that x occupies temporally projects onto y."@en ;
                 <http://www.w3.org/2004/02/skos/core#example> "The Second World War occupies the temporal region September 1, 1939 - September 2, 1945"@en .