diff --git a/src/cco-modules/EventOntology.ttl b/src/cco-modules/EventOntology.ttl
index 5e0a9b8..18c3d74 100644
--- a/src/cco-modules/EventOntology.ttl
+++ b/src/cco-modules/EventOntology.ttl
@@ -203,7 +203,7 @@ cco:ont00000079 rdf:type owl:Class ;
 cco:ont00000083 rdf:type owl:Class ;
                  rdfs:subClassOf obo:BFO_0000035 ;
                  rdfs:label "Process Ending"@en ;
-                 skos:definition "A Process Boundary that occurs on a Zero-Dimensional Temporal Region that is the ending instant of the One-Dimensional Temporal Region on which the Process, of which the Process Boundary is a part, occurs."@en ;
+                 skos:definition "A Process Boundary that occupies a Zero-Dimensional Temporal Region that is the ending instant of the One-Dimensional Temporal Region that the Process, of which the Process Boundary is a part, occupies."@en ;
                  cco:ont00001760 "https://www.commoncoreontologies.org/EventOntology"^^xsd:anyURI .
 
 
@@ -476,7 +476,7 @@ cco:ont00000191 rdf:type owl:Class ;
 cco:ont00000197 rdf:type owl:Class ;
                  rdfs:subClassOf obo:BFO_0000035 ;
                  rdfs:label "Process Beginning"@en ;
-                 skos:definition "A Process Boundary that occurs on a Zero-Dimensional Temporal Region that is the starting instant of the One-Dimensional Temporal Region on which the Process, of which the Process Boundary is a part, occurs."@en ;
+                 skos:definition "A Process Boundary that occupies a Zero-Dimensional Temporal Region that is the starting instant of the One-Dimensional Temporal Region that the Process, of which the Process Boundary is a part, occupies."@en ;
                  cco:ont00001760 "https://www.commoncoreontologies.org/EventOntology"^^xsd:anyURI .
 
 
@@ -2712,7 +2712,7 @@ cco:ont00001194 rdf:type owl:Class ;
                                                         rdf:type owl:Class
                                                       ]
                                  ] ;
-                 skos:scopeNote "This class should be used to demarcate the start of the temporal interval (through the occurs_on property) that the Entity bears the Role."@en ;
+                 skos:scopeNote "This class should be used to demarcate the start of the temporal interval (through the occupies temporal region property) that the Entity bears the Role."@en ;
                  rdfs:label "Gain of Role"@en ;
                  skos:definition "A Gain of Realizable Entity in which some Independent Continuant becomes bearer of some Role."@en ;
                  cco:ont00001760 "https://www.commoncoreontologies.org/EventOntology"^^xsd:anyURI .
@@ -2978,7 +2978,7 @@ cco:ont00001289 rdf:type owl:Class ;
                                "Damaged"@en ,
                                "Injured"@en ;
                  skos:definition "A Stasis of Specifically Dependent Continuant in which some Independent Continuant bears a Quality or Realizable Entity that has suffered impairment (i.e., a decrease or loss) due to a previous action or event such that the Independent Continuant is now of lesser value, usefulness, or functionality."@en ;
-                 skos:scopeNote "This class can be used to instantiate instances that might otherwise be treated by defined classes such as Damaged Vehicle or Wounded Person. The Independent Continuant and Quality or Realizable Entity are participants of the stasis which can in turn be related to the temporal interval via the occurs on property. "@en ;
+                 skos:scopeNote "This class can be used to instantiate instances that might otherwise be treated by defined classes such as Damaged Vehicle or Wounded Person. The Independent Continuant and Quality or Realizable Entity are participants of the stasis which can in turn be related to the temporal interval via the occupies temporal region property. "@en ;
                  cco:ont00001754 "http://www.thefreedictionary.com/damaged" ;
                  cco:ont00001760 "https://www.commoncoreontologies.org/EventOntology"^^xsd:anyURI .
 
diff --git a/src/cco-modules/ExtendedRelationOntology.ttl b/src/cco-modules/ExtendedRelationOntology.ttl
index e5009d2..d8a9a12 100644
--- a/src/cco-modules/ExtendedRelationOntology.ttl
+++ b/src/cco-modules/ExtendedRelationOntology.ttl
@@ -440,7 +440,7 @@ cco:ont00001857 rdf:type owl:ObjectProperty ;
                 rdfs:domain obo:BFO_0000015 ;
                 rdfs:range obo:BFO_0000015 ;
                 rdfs:label "is part of process"@en ;
-                skos:definition "x is_part_of_process y iff x and y are instances of Process, such that x occurs during the temporal interval of y, and x either provides an input to y or receives an output of y."@en ;
+                skos:definition "x is_part_of_process y iff x and y are instances of Process, such that x occupies a temporal region that is a proper occurrent part of the temporal interval of y, and x either provides an input to y or receives an output of y."@en ;
                 cco:ont00001760 "https://www.commoncoreontologies.org/ExtendedRelationOntology"^^xsd:anyURI .
 
 
@@ -550,7 +550,7 @@ cco:ont00001933 rdf:type owl:ObjectProperty ;
                 rdfs:domain obo:BFO_0000015 ;
                 rdfs:range obo:BFO_0000015 ;
                 rdfs:label "process starts"@en ;
-                skos:definition "x process_starts y iff x and y are instances of processes, and x is_cause_of y, and i is an instance of a temporal instant, and r is an instance of a temporal interval, and y has starting instance i, and x occurs on r, and r has inside instant i."@en ;
+                skos:definition "x process_starts y iff x and y are instances of processes, and x is_cause_of y, and i is an instance of a temporal instant, and r is an instance of a temporal interval, and y has starting instance i, and x occupies temporal region r, and r has inside instant i."@en ;
                 skos:scopeNote "A process x starts another process y when x causes y while x is still occurring."@en ;
                 cco:ont00001760 "https://www.commoncoreontologies.org/ExtendedRelationOntology"^^xsd:anyURI .