diff --git a/jquery.elang/jquery.elang.d.ts b/jquery.elang/jquery.elang.d.ts
new file mode 100644
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--- /dev/null
+++ b/jquery.elang/jquery.elang.d.ts
@@ -0,0 +1,314 @@
+// Type definitions for eLang 0.5.1
+// Project: https://github.com/sumegizoltan/ELang/
+// Definitions by: Zoltan Sumegi <https://github.com/sumegizoltan/>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+/// <reference path="../jquery/jquery.d.ts" />
+
+interface IPageResource {
+    lang?: IPageLangItems;
+    selectedLang?: string;
+}
+
+interface IPageLangItems {
+    en?: IPageLabels;
+    hu?: IPageLabels;
+}
+
+interface IPageLabels {
+    lblTitle?: string;
+    lblPageHeader?: string;
+    lblSearchField?: string;
+    lblEditKeyField?: string;
+    lblEditValueField?: string;
+    lblFindedExpressionsHead?: string;
+    lblEditedExpressionsHead?: string;
+    lblFindHead?: string;
+    lblEditHead?: string;
+    lblFind?: string;
+    lblAdd?: string;
+    lblModify?: string;
+    lblRemove?: string;
+    lblSearchInExpressions?: string;
+    lblSearchInMeanings?: string;
+    lblSearchInExpressionsHlp?: string;
+    lblSearchInMeaningsHlp?: string;
+    lblTestHead?: string;
+    lblOrderedTest?: string;
+    lblRandomlyTest?: string;
+    lblTypedTest?: string;
+    lblSelectedTest?: string;
+    lblWrittedTest?: string;
+    lblVoicedTest?: string;
+    lblStartTest?: string;
+    lblStopTest?: string;
+    lblTypedTestHlp?: string;
+    lblSelectedTestHlp?: string;
+    lblOrderedTestHlp?: string;
+    lblRandomlyTestHlp?: string;
+    lblWrittedTestHlp?: string;
+    lblVoicedTestHlp?: string;
+}
+
+interface ELangCommonStatic {
+    resource: IPageResource;
+    getLabel(labelid: string, langid?: string): string;
+    setLang(langid: string, node?: JQuery): void;
+}
+
+// ELang database (LocalStorage) functionality with Singleton instance
+
+interface IELangDBOptions {
+    autocompleteRows: number;
+}
+
+interface IELangDBDelegates {
+    selectHandler: Function;
+    insertHandler: Function;
+    modifyHandler: Function;
+    removeHandler: Function;
+}
+
+interface IELangDBEvents {
+    select: JQueryDeferred;
+    insert: JQueryDeferred;
+    modify: JQueryDeferred;
+    remove: JQueryDeferred;
+}
+
+interface IELangDB {
+    cache?: any;
+    delegates?: IELangDBDelegates;
+    events?: IELangDBEvents;
+    isInitialized?: bool;
+    options?: IELangDBOptions;
+
+    name?: string;
+    description?: string;
+
+    initialize(options?: IELangDBOptions): void;
+
+    _onSelect(id: string, callback?: Function): void;
+    _onInsert(id: string, value: string, callback?: Function): void;
+    _onModify(id: string, value: string, callback?: Function): void;
+    _onRemove(id: string, callback?: Function): void;
+
+    select(id: string, callback?: Function): void;
+    insert(id: string, value: string, callback?: Function): void;
+    modify(id: string, value: string, callback?: Function): void;
+    remove(id: string, callback?: Function): void;
+
+    sort(): void;
+    setOptions(options: IELangDBOptions): void;
+    getIndexHash(id: string): string;
+    getOptions(): IELangDBOptions;
+}
+
+interface ELangStatic {
+    getInstance(options?: IELangDBOptions): IELangDB;
+}
+
+// ELangBase
+
+interface IELangBaseDefaults {
+    contentCSS: string;
+    contentInnerCSS: string;
+    resultCSS: string;
+    resultHeadCSS: string;
+    contentInnerHtml: string;
+    fluidRowHtml: string;
+    radioGroupHtml: string;
+    radioButtonHtml: string;
+    submitButtonHtml: string;
+    headLabelHtml: string;
+    resultHeadLabelHtml: string;
+    resultHtml: string;
+    headLabel: string;
+    resultHeadLabel: string;
+}
+
+interface IELangBase {
+    name: string;
+    description: string;
+    delegates: any;
+    element: JQuery;
+    events: any;
+    options: any;
+    defaults: IELangBaseDefaults;
+
+    initialize(target: HTMLElement, options: any): void;
+
+    createContent(): void;
+
+    createRadioGroup(node: JQuery,
+                     isMethodAppend: bool,
+                     buttonNumber: number,
+                     defaultButton: number,
+                     btnLabels: string[],
+                     clickHandler: Function,
+                     btnTooltips?: string[]): void;
+    appendAsLastChild(node: JQuery, element: JQuery): JQuery;
+    getLastChild(node: JQuery): JQuery;
+    isRdoChecked(eSrc: HTMLElement, rdoId: string): bool;
+    processCommand(command: string): JQuery;
+    setOptions(options: any): void;
+}
+
+// ELangSearch
+
+interface IELangSearchDefaults extends IELangBaseDefaults {
+    expressionsLabel: string;
+    expressionsTooltip: string;
+    meaningsLabel: string;
+    meaningsTooltip: string;
+    searchFormHtml: string;
+    searchFieldHtml: string;
+    searchButtonLabel: string;
+}
+
+interface IELangSearchDelegates {
+    selectHandler: Function;
+    selectCallback: Function;
+    langDirectionHandler: Function;
+    langDirectionClickHandler: Function;
+    searchHandler: Function;
+    searchClickHandler: Function;
+}
+
+interface IELangSearchEvents {
+    select: JQueryDeferred;
+}
+
+interface IELangSearch extends IELangBase {
+    defaults: IELangSearchDefaults;
+    delegates: IELangSearchDelegates;
+    events: IELangSearchEvents;
+    isSearchInExp: bool;
+
+    initialize(target: HTMLElement, options: any): void;
+    createContent(): void;
+
+    _onDirectionClick(eSrc: HTMLElement): void;
+    _onSelect(eSrc: HTMLInputElement): void;
+    _onSelectCallback(): void;
+
+    _select(eSrc: HTMLInputElement): void;
+}
+
+// ELangEdit
+
+interface IELangEditDelegates {
+    insertHandler: Function;
+    modifyHandler: Function;
+    removeHandler: Function;
+    selectHandler: Function;
+    btnAddHandler: Function;
+    btnAddClickHandler: Function;
+
+    insertCallback: Function;
+    modifyCallback: Function;
+    removeCallback: Function;
+    selectCallback: Function;
+}
+
+interface IELangEditEvents {
+    insert: JQueryDeferred;
+    modify: JQueryDeferred;
+    remove: JQueryDeferred;
+    select: JQueryDeferred;
+}
+
+interface IELangEditDefaults extends IELangBaseDefaults {
+    editFormHtml: string;
+    editFieldHtml: string;
+    addButtonHtml: string;
+    addButtonLabel: string;
+    editKeyLabel: string;
+    editValueLabel: string;
+}
+
+interface IELangEdit extends IELangBase {
+    defaults: IELangEditDefaults;
+    delegates: IELangEditDelegates;
+    events: IELangEditEvents;
+
+    initialize(target: HTMLElement, options: any): void;
+    createContent(): void;
+
+    _onAddClick(key: HTMLInputElement, value: HTMLInputElement): void;
+    _onInsert(): void;
+    _onInsertCallback(): void;
+    _onModify(): void;
+    _onModifyCallback(): void;
+    _onRemove(): void;
+    _onRemoveCallback(): void;
+    _onSelect(): void;
+    _onSelectCallback(): void;
+
+
+    _insert(): void;
+    _modify(): void;
+    _remove(): void;
+    _select(): void;
+}
+
+// ELangTest
+
+interface IELangTestDefaults extends IELangBaseDefaults {
+    formHtml: string;
+    startButtonLabel: string;
+    stopButtonLabel: string;
+    rdoTypedLabel: string;
+    rdoSelectedLabel: string;
+    rdoOrderedLabel: string;
+    rdoRandomlyLabel: string;
+    rdoWrittedLabel: string;
+    rdoVoicedLabel: string;
+    rdoTypedTooltip: string;
+    rdoSelectedTooltip: string;
+    rdoOrderedTooltip: string;
+    rdoRandomlyTooltip: string;
+    rdoWrittedTooltip: string;
+    rdoVoicedTooltip: string;
+}
+
+interface IELangTestDelegates {
+    startStopHandler: Function;
+
+    rdoVariantHandler: Function;
+    rdoModeHandler: Function;
+    rdoQuestionHandler: Function;
+
+    rdoVariantClickHandler: Function;
+    rdoModeClickHandler: Function;
+    rdoQuestionClickHandler: Function;
+}
+
+interface IELangTest extends IELangBase {
+    defaults: IELangTestDefaults;
+    delegates: IELangTestDelegates;
+
+    initialize(target: HTMLElement, options: any): void;
+    createContent(): void;
+
+    _onRdoVariantClick(eSrc: HTMLElement): void;
+    _onRdoModeClick(eSrc: HTMLElement): void;
+    _onRdoQuestionClick(eSrc: HTMLElement): void;
+    _onStartStopClick(): void;
+}
+
+// interfaces for jQuery.fn.__plugin
+
+interface IFnNewInstance {
+    createInstance(el: HTMLElement,
+                   options: any,
+                   pluginName: string): JQuery;
+}
+
+interface IFnJQuery {
+    fnPlugin(context: JQuery,
+             options: any,
+             command: string,
+             pluginName: string,
+             pluginDataAttribute: string): JQuery;
+}
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