diff --git a/compiler/assemble.pas b/compiler/assemble.pas
index 370fc46fa0..3033866647 100644
--- a/compiler/assemble.pas
+++ b/compiler/assemble.pas
@@ -2027,7 +2027,7 @@ Implementation
            MaybeNextList(hp);
          end;
         ObjData.afteralloc;
-        { leave if errors have occured }
+        { leave if errors have occurred }
         if errorcount>0 then
          goto doexit;
 
@@ -2048,7 +2048,7 @@ Implementation
         ObjData.createsection(sec_code);
         ObjData.afteralloc;
 
-        { leave if errors have occured }
+        { leave if errors have occurred }
         if errorcount>0 then
          goto doexit;
 
@@ -2069,7 +2069,7 @@ Implementation
         ObjData.createsection(sec_code);
         ObjData.afterwrite;
 
-        { don't write the .o file if errors have occured }
+        { don't write the .o file if errors have occurred }
         if errorcount=0 then
          begin
            { write objectfile }
@@ -2122,7 +2122,7 @@ Implementation
              ObjData.CreateSection(startsectype,startsecname,startsecorder);
            TreePass0(hp);
            ObjData.afteralloc;
-           { leave if errors have occured }
+           { leave if errors have occurred }
            if errorcount>0 then
              break;
 
@@ -2135,7 +2135,7 @@ Implementation
            TreePass1(hp);
            ObjData.afteralloc;
 
-           { leave if errors have occured }
+           { leave if errors have occurred }
            if errorcount>0 then
              break;
 
@@ -2149,7 +2149,7 @@ Implementation
            hp:=TreePass2(hp);
            ObjData.afterwrite;
 
-           { leave if errors have occured }
+           { leave if errors have occurred }
            if errorcount>0 then
              break;
 
diff --git a/compiler/powerpc/agppcmpw.pas b/compiler/powerpc/agppcmpw.pas
index 6ef9437dfe..16383d3fa3 100644
--- a/compiler/powerpc/agppcmpw.pas
+++ b/compiler/powerpc/agppcmpw.pas
@@ -127,7 +127,7 @@ interface
       t32bitarray = array[0..3] of byte;
 
     function ReplaceForbiddenChars(var s: string):Boolean;
-         {Returns wheater a replacement has occured.}
+         {Returns wheater a replacement has occurred.}
 
         var
           i:Integer;
diff --git a/compiler/powerpc/cgcpu.pas b/compiler/powerpc/cgcpu.pas
index 8f1ac17136..74f4255141 100644
--- a/compiler/powerpc/cgcpu.pas
+++ b/compiler/powerpc/cgcpu.pas
@@ -771,7 +771,7 @@ const
      { one.                                                                     }
      { This procedure may be called before, as well as after g_return_from_proc }
      { is called. NOTE registers are not to be allocated through the register   }
-     { allocator here, because the register colouring has already occured !!    }
+     { allocator here, because the register colouring has already occurred !!    }
 
 
      var regcounter,firstregfpu,firstregint: TSuperRegister;
@@ -921,7 +921,7 @@ const
     procedure tcgppc.g_proc_exit(list : TAsmList;parasize : longint;nostackframe:boolean);
      { This procedure may be called before, as well as after g_stackframe_entry }
      { is called. NOTE registers are not to be allocated through the register   }
-     { allocator here, because the register colouring has already occured !!    }
+     { allocator here, because the register colouring has already occurred !!    }
 
       var
          regcounter,firstregfpu,firstregint: TsuperRegister;
diff --git a/compiler/powerpc64/cgcpu.pas b/compiler/powerpc64/cgcpu.pas
index 93fef36f01..dae77c500c 100644
--- a/compiler/powerpc64/cgcpu.pas
+++ b/compiler/powerpc64/cgcpu.pas
@@ -1115,7 +1115,7 @@ end;
  called by the current one
 
  IMPORTANT: registers are not to be allocated through the register
- allocator here, because the register colouring has already occured !!
+ allocator here, because the register colouring has already occurred !!
 }
 procedure tcgppc.g_proc_entry(list: TAsmList; localsize: longint;
   nostackframe: boolean);
@@ -1281,7 +1281,7 @@ end;
  is called.
 
  IMPORTANT: registers are not to be allocated through the register
- allocator here, because the register colouring has already occured !!
+ allocator here, because the register colouring has already occurred !!
 }
 procedure tcgppc.g_proc_exit(list: TAsmList; parasize: longint; nostackframe:
   boolean);
diff --git a/compiler/script.pas b/compiler/script.pas
index e49b73a113..9285326639 100644
--- a/compiler/script.pas
+++ b/compiler/script.pas
@@ -269,10 +269,10 @@ Begin
   AddStart('@echo off');
   Add('goto end');
   Add(':asmend');
-  Add('echo An error occured while assembling %THEFILE%');
+  Add('echo An error occurred while assembling %THEFILE%');
   Add('goto end');
   Add(':linkend');
-  Add('echo An error occured while linking %THEFILE%');
+  Add('echo An error occurred while linking %THEFILE%');
   Add(':end');
   inherited WriteToDisk;
 end;
@@ -336,11 +336,11 @@ Begin
   Add('skip end');
   Add('lab asmend');
   Add('why');
-  Add('echo An error occured while assembling $THEFILE');
+  Add('echo An error occurred while assembling $THEFILE');
   Add('skip end');
   Add('lab linkend');
   Add('why');
-  Add('echo An error occured while linking $THEFILE');
+  Add('echo An error occurred while linking $THEFILE');
   Add('lab end');
   inherited WriteToDisk;
 end;
diff --git a/utils/fpdoc/intl/dwriter.de.po b/utils/fpdoc/intl/dwriter.de.po
index ebe2f3f3d1..fb34cdd363 100644
--- a/utils/fpdoc/intl/dwriter.de.po
+++ b/utils/fpdoc/intl/dwriter.de.po
@@ -1,5 +1,5 @@
 #: dwriter:serrfilewriting
-msgid "An error occured during writing of file \"%s\": %s"
+msgid "An error occurred during writing of file \"%s\": %s"
 msgstr "Beim Schreiben der Datei \"%s\" ist ein Fehler aufgetrete: %s"
 
 #: dwriter:serrinvalidshortdescr