diff --git a/ontology/saref4ehaw.ttl b/ontology/saref4ehaw.ttl
index 8673d78b2899ea5a68a45b881ba3224bec671fa1..ae0fcec05e9f1b599133f4d3ccdc16d56e175b55 100644
--- a/ontology/saref4ehaw.ttl
+++ b/ontology/saref4ehaw.ttl
@@ -288,7 +288,7 @@ s4ehaw:hasPosture rdf:type owl:ObjectProperty ;
 
 ###  https://saref.etsi.org/saref4ehaw/hasPowerSource
 s4ehaw:hasPowerSource rdf:type owl:ObjectProperty ;
-                      rdfs:domain s4ehaw:DeviceCharesteristic ;
+                      rdfs:domain s4ehaw:DeviceCharacteristic ;
                       rdfs:range s4ehaw:PowerSource ;
                       rdfs:comment "A health device characteristic is its  power sources, mainly describing energy source and battery related capabilities of the health device (number of power source, source type, rechargeable or not, available power level...)."@en ;
                       rdfs:label "has power source"@en .
@@ -302,12 +302,12 @@ s4ehaw:hasResponsibleParty rdf:type owl:ObjectProperty ;
                            rdfs:label "has responsible party"@en .
 
 
-###  https://saref.etsi.org/saref4ehaw/hasTimeSeriesMesurements
-s4ehaw:hasTimeSeriesMesurements rdf:type owl:ObjectProperty ;
+###  https://saref.etsi.org/saref4ehaw/hasTimeSeriesMesurement
+s4ehaw:hasTimeSeriesMesurement rdf:type owl:ObjectProperty ;
                                 rdfs:domain s4ehaw:Data ;
-                                rdfs:range s4ehaw:TimeSeriesMeasurements ;
+                                rdfs:range s4ehaw:TimeSeriesMeasurement ;
                                 rdfs:comment "Data has time series measurements, a sequence taken at successive equally spaced points in time."@en ;
-                                rdfs:label "has time series measurements"@en .
+                                rdfs:label "has time series measurement"@en .
 
 
 ###  https://saref.etsi.org/saref4ehaw/inCurrentMode
@@ -973,7 +973,7 @@ s4ehaw:Data rdf:type owl:Class ;
 ###  https://saref.etsi.org/saref4ehaw/DeviceCharacteristic
 s4ehaw:DeviceCharacteristic rdf:type owl:Class ;
                   rdfs:comment "A health device has device characteristic describing the physical characteristics of the health device."@en ;
-                  rdfs:label "Device characreristic"@en .
+                  rdfs:label "Device characteristic"@en .
 
 
 ###  https://saref.etsi.org/saref4ehaw/EventDrivenBanCommunicationType
@@ -1176,8 +1176,8 @@ s4ehaw:ServiceProfile rdf:type owl:Class ;
                       rdfs:label "Service profile"@en .
 
 
-###  https://saref.etsi.org/saref4ehaw/TimeSeriesMeasurements
-s4ehaw:TimeSeriesMeasurements rdf:type owl:Class ;
+###  https://saref.etsi.org/saref4ehaw/TimeSeriesMeasurement
+s4ehaw:TimeSeriesMeasurement rdf:type owl:Class ;
                               rdfs:subClassOf saref:Measurement ,
                                               [ rdf:type owl:Restriction ;
                                                 owl:onProperty s4envi:hasFrequencyMeasurement ;
@@ -1188,7 +1188,7 @@ s4ehaw:TimeSeriesMeasurements rdf:type owl:Class ;
                                                 owl:allValuesFrom xsd:float
                                               ] ;
                               rdfs:comment "A sequence of data in a successive equally spaced points in time. The O&M ontology (ISO 19156) defines Time Series Observation  as an “observation whose result is a time-series”, while both Hl7 aECG and DICOM standards define the Series element as a sequence of data sharing a common frame of reference. In SAREF4health this concept is termed as Time Series Measurements since this sequence of data refers to time series measured by a health device." ;
-                              rdfs:label "Time series measurements" .
+                              rdfs:label "Time series measurement" .
 
 
 ###  https://saref.etsi.org/saref4ehaw/User