diff --git a/config/retriex/language.yaml b/config/retriex/language.yaml
index dc38fcf..1ff347c 100644
--- a/config/retriex/language.yaml
+++ b/config/retriex/language.yaml
@@ -230,6 +230,17 @@ parameters:
         - gibt es
         - suche im shop
 
+    # Reusable cleanup group sets keep common profile compositions in one place.
+    # Profiles may still add local group references after these shared sets.
+    stopword_group_sets:
+      de_conversation:
+        - de_core
+        - conversation
+
+    phrase_group_sets:
+      user_instruction:
+        - user_instruction
+
     meta_term_groups:
       presentation:
         - tabelle
@@ -256,40 +267,40 @@ parameters:
 
     cleanup_profiles:
       commerce_query:
+        stopword_group_sets:
+          - de_conversation
         stopword_groups:
-          - de_core
-          - conversation
           - pronouns
           - user_instruction_terms
           - response_style
-        phrase_groups:
+        phrase_group_sets:
           - user_instruction
 
       rag_evidence:
+        stopword_group_sets:
+          - de_conversation
         stopword_groups:
-          - de_core
-          - conversation
           - user_instruction_terms
 
       retrieval_reference_cleanup:
+        stopword_group_sets:
+          - de_conversation
         stopword_groups:
-          - de_core
-          - conversation
           - question_terms
         meta_term_groups:
           - retrieval_reference
 
       shop_context_fallback:
+        stopword_group_sets:
+          - de_conversation
         stopword_groups:
-          - de_core
-          - conversation
           - pronouns
           - user_instruction_terms
           - question_terms
           - usage_terms
           - reference_fillers
           - response_style
-        phrase_groups:
+        phrase_group_sets:
           - user_instruction
         meta_term_groups:
           - presentation
diff --git a/patch_history/RETRIEX_PATCH_43N_LANGUAGE_CLEANUP_GROUP_SETS_README.md b/patch_history/RETRIEX_PATCH_43N_LANGUAGE_CLEANUP_GROUP_SETS_README.md
new file mode 100644
index 0000000..23d6714
--- /dev/null
+++ b/patch_history/RETRIEX_PATCH_43N_LANGUAGE_CLEANUP_GROUP_SETS_README.md
@@ -0,0 +1,46 @@
+# RetrieX Patch 43N - Language Cleanup Group Sets
+
+## Goal
+
+Reduce repeated cleanup-profile group compositions in `language.yaml` without changing effective cleanup behavior.
+
+## Changes
+
+- Added optional `stopword_group_sets` and `phrase_group_sets` to `config/retriex/language.yaml`.
+- Moved repeated `de_core` + `conversation` profile composition into `stopword_group_sets.de_conversation`.
+- Moved repeated `user_instruction` phrase composition into `phrase_group_sets.user_instruction`.
+- Updated `LanguageCleanupConfig` to resolve group sets before local profile groups.
+- Existing `stopword_groups`, `phrase_groups`, and `meta_term_groups` remain supported.
+
+## Non-goals
+
+- No new domain/runtime logic.
+- No scoring changes.
+- No prompt-rule changes.
+- No retrieval changes.
+- No admin UI changes.
+- No new hard-coded fachliche lists in PHP core.
+
+## Expected effective behavior
+
+The effective cleanup profile outputs remain identical to p43M:
+
+- `commerce_query`: same stopwords, phrases, meta terms, protected terms.
+- `rag_evidence`: same stopwords, phrases, meta terms, protected terms.
+- `retrieval_reference_cleanup`: same stopwords, phrases, meta terms, protected terms.
+- `shop_context_fallback`: same stopwords, phrases, meta terms, protected terms.
+
+## Local checks performed
+
+```bash
+php -l src/Config/LanguageCleanupConfig.php
+php -l src/Config/GovernanceConfig.php
+php -l src/Config/AgentRunnerConfig.php
+php -l src/Config/PromptBuilderConfig.php
+php -l src/Config/SearchRepairConfig.php
+python3 YAML parse check for config/retriex/*.yaml
+python3 effective p43M-vs-p43N cleanup profile comparison
+php LanguageCleanupConfig effective resolver comparison
+```
+
+The local `bin/console` checks could not be executed in this artifact environment because the ZIP does not include `vendor/` and Composer dependencies are unavailable here.
diff --git a/src/Config/LanguageCleanupConfig.php b/src/Config/LanguageCleanupConfig.php
index 820f442..2bca0d0 100644
--- a/src/Config/LanguageCleanupConfig.php
+++ b/src/Config/LanguageCleanupConfig.php
@@ -163,10 +163,14 @@ final class LanguageCleanupConfig
     private function resolveGroupedTerms(string $profileName, string $profileKey, string $rootKey): array
     {
         $profile = $this->requiredCleanupProfile($profileName);
-        $groupNames = $this->stringListFromValue(
-            $this->profileValue($profile, $profileKey),
-            sprintf('cleanup_profiles.%s.%s', $profileName, $profileKey),
-            false
+        $groupNames = $this->resolveProfileGroupSetTerms($profileName, $profile, $profileKey);
+        $groupNames = $this->mergeUnique(
+            $groupNames,
+            $this->stringListFromValue(
+                $this->profileValue($profile, $profileKey),
+                sprintf('cleanup_profiles.%s.%s', $profileName, $profileKey),
+                false
+            )
         );
 
         if ($groupNames === []) {
@@ -193,6 +197,66 @@ final class LanguageCleanupConfig
         return $out;
     }
 
+    /**
+     * @param array<string, mixed> $profile
+     * @return string[]
+     */
+    private function resolveProfileGroupSetTerms(string $profileName, array $profile, string $profileKey): array
+    {
+        $profileSetKey = $this->profileGroupSetKey($profileKey);
+        $setNames = $this->stringListFromValue(
+            $this->profileValue($profile, $profileSetKey),
+            sprintf('cleanup_profiles.%s.%s', $profileName, $profileSetKey),
+            false
+        );
+
+        if ($setNames === []) {
+            return [];
+        }
+
+        $rootSetKey = $this->rootGroupSetKey($profileKey);
+        $sets = $this->requiredMap($rootSetKey);
+        $out = [];
+
+        foreach ($setNames as $setName) {
+            if (!array_key_exists($setName, $sets)) {
+                throw $this->invalid(
+                    sprintf('cleanup_profiles.%s.%s', $profileName, $profileSetKey),
+                    sprintf('references unknown group set "%s"', $setName)
+                );
+            }
+
+            $out = $this->mergeUnique(
+                $out,
+                $this->stringListFromValue($sets[$setName], sprintf('%s.%s', $rootSetKey, $setName), true)
+            );
+        }
+
+        return $out;
+    }
+
+    private function profileGroupSetKey(string $profileKey): string
+    {
+        if ($profileKey === 'stopword_groups') {
+            return 'stopword_group_sets';
+        }
+
+        if ($profileKey === 'phrase_groups') {
+            return 'phrase_group_sets';
+        }
+
+        if ($profileKey === 'meta_term_groups') {
+            return 'meta_term_group_sets';
+        }
+
+        return sprintf('%s_sets', $profileKey);
+    }
+
+    private function rootGroupSetKey(string $profileKey): string
+    {
+        return $this->profileGroupSetKey($profileKey);
+    }
+
     /** @return array<string, mixed> */
     private function requiredCleanupProfile(string $profileName): array
     {