diff --git a/ChangeLog.md b/ChangeLog.md
index f228dc1ee..16c922c60 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -320,7 +320,7 @@
 * changed logging for messages from "updated" to "received" and "sent" depending on who initiated the request and added message direction/scan/poll/update info
 * added support for serving .csv files and new argument maxage to HTTP/JSON port
 * added timeout argument and error result code to ebusctl
-* added "-def" option to "read" and "write" commands and "define" command to test message defintions and add new definitions during runtime and disabled all by default (use "--enabledefine" command line option).
+* added "-def" option to "read" and "write" commands and "define" command to test message definitions and add new definitions during runtime and disabled all by default (use "--enabledefine" command line option).
 * added "encode" and "decode" commands for testing field definitions
 * added option to ignore failed host name resolution during initialization of MQTT
 * added logging when device became invalid and close it on error
diff --git a/contrib/html/openapi.yaml b/contrib/html/openapi.yaml
index 053ccf96e..33f0ef15d 100644
--- a/contrib/html/openapi.yaml
+++ b/contrib/html/openapi.yaml
@@ -203,7 +203,7 @@ paths:
                 $ref: '#/components/schemas/RawMessages'
   /decode:
     get:
-      summary: Decode raw data with the specified field defintion.
+      summary: Decode raw data with the specified field definition.
       parameters:
         - name: def
           in: query
diff --git a/src/ebusd/mainloop.cpp b/src/ebusd/mainloop.cpp
index 339772cfa..5372e9c5c 100644
--- a/src/ebusd/mainloop.cpp
+++ b/src/ebusd/mainloop.cpp
@@ -2048,7 +2048,7 @@ result_t MainLoop::executeHelp(ostringstream* ostream) {
   *ostream << "usage:\n"
       " read|r    Read value(s):         read [-f] [-m SECONDS] [-s QQ] [-d ZZ] [-c CIRCUIT] [-p PRIO] [-v|-V] [-n|-N]"
       " [-i VALUE[;VALUE]*] NAME [FIELD[.N]]\n"
-      "           Read by new defintion: read [-f] [-m SECONDS] [-s QQ] [-d ZZ] [-v|-V] [-n|-N]"
+      "           Read by new definition: read [-f] [-m SECONDS] [-s QQ] [-d ZZ] [-v|-V] [-n|-N]"
       " [-i VALUE[;VALUE]*] -def DEFINITION (if enabled)\n"
       "           Read hex message:      read [-f] [-m SECONDS] [-s QQ] [-c CIRCUIT] -h ZZPBSBNN[DD]*\n"
       " write|w   Write value(s):        write [-s QQ] [-d ZZ] -c CIRCUIT NAME [VALUE[;VALUE]*]\n"
@@ -2077,7 +2077,7 @@ result_t MainLoop::executeHelp(ostringstream* ostream) {
       " dump      Toggle binary dump of received bytes\n"
       " reload    Reload CSV config files\n"
       " quit|q    Close connection\n"
-      " help|?    Print help             help [COMMAND], COMMMAND ?";
+      " help|?    Print help             help [COMMAND], COMMAND ?";
   return RESULT_OK;
 }
 
diff --git a/src/lib/utils/arg.h b/src/lib/utils/arg.h
index b97fefda4..9bf99f699 100755
--- a/src/lib/utils/arg.h
+++ b/src/lib/utils/arg.h
@@ -56,13 +56,13 @@ typedef int (*parse_function_t)(int key, char *arg, const struct argParseOpt *pa
 
 /** Options for child definitions. */
 typedef struct argParseChildOpt {
-  const argDef *argDefs;  //!< pointer to the argument defintions (last one needs to have nullptr help as end sign)
+  const argDef *argDefs;  //!< pointer to the argument definitions (last one needs to have nullptr help as end sign)
   parse_function_t parser;  //!< parse function to use
 } argParseChildOpt;
 
 /** Options to pass to @a argParse(). */
 typedef struct argParseOpt {
-  const argDef *argDefs;  //!< pointer to the argument defintions (last one needs to have nullptr help as end sign)
+  const argDef *argDefs;  //!< pointer to the argument definitions (last one needs to have nullptr help as end sign)
   parse_function_t parser;  //!< parse function to use
   int flags;  //!< flags for the parser, bit combination of @a ArgFlag
   const char* help;  //!< help text for the program (second line of help output)
diff --git a/src/tools/intelhex/intelhexclass.cpp b/src/tools/intelhex/intelhexclass.cpp
index d81934ace..7d02eb7af 100644
--- a/src/tools/intelhex/intelhexclass.cpp
+++ b/src/tools/intelhex/intelhexclass.cpp
@@ -478,7 +478,7 @@ istream& operator>>(istream& dataIn, intelhex& ihLocal)
                                      ihLineIterator);
             if (ihLocal.verbose == true)
             {
-              cout << "Data Record begining @ 0x" <<
+              cout << "Data Record beginning @ 0x" <<
                    ihLocal.ulToHexString(loadOffset) << endl;
             }
             break;