diff --git a/src/browser/CoreBrowserTerminal.ts b/src/browser/CoreBrowserTerminal.ts
index f7e20b914..d089c62c0 100644
--- a/src/browser/CoreBrowserTerminal.ts
+++ b/src/browser/CoreBrowserTerminal.ts
@@ -102,7 +102,7 @@ export class CoreBrowserTerminal extends CoreTerminal implements ITerminal {
   private _keyDownHandled: boolean = false;
 
   /**
-   * Records whether a keydown event has occured since the last keyup event, i.e. whether a key
+   * Records whether a keydown event has occurred since the last keyup event, i.e. whether a key
    * is currently "pressed".
    */
   private _keyDownSeen: boolean = false;
diff --git a/src/browser/TimeBasedDebouncer.ts b/src/browser/TimeBasedDebouncer.ts
index 0860e7927..6c92aad24 100644
--- a/src/browser/TimeBasedDebouncer.ts
+++ b/src/browser/TimeBasedDebouncer.ts
@@ -47,7 +47,7 @@ export class TimeBasedDebouncer implements IRenderDebouncer {
     // enough time to pass before refreshing again.
     const refreshRequestTime: number = performance.now();
     if (refreshRequestTime - this._lastRefreshMs >= this._debounceThresholdMS) {
-      // Enough time has lapsed since the last refresh; refresh immediately
+      // Enough time has elapsed since the last refresh; refresh immediately
       this._lastRefreshMs = refreshRequestTime;
       this._innerRefresh();
     } else if (!this._additionalRefreshRequested) {
diff --git a/src/common/Types.ts b/src/common/Types.ts
index 9e1481fd3..b73fc8413 100644
--- a/src/common/Types.ts
+++ b/src/common/Types.ts
@@ -181,7 +181,7 @@ export interface ICoreMouseEvent {
   x: number;
   y: number;
   /**
-   * Button the action occured. Due to restrictions of the tracking protocols
+   * Button the action occurred. Due to restrictions of the tracking protocols
    * it is not possible to report multiple buttons at once.
    * Wheel is treated as a button.
    * There are invalid combinations of buttons and actions possible
diff --git a/src/common/input/Keyboard.ts b/src/common/input/Keyboard.ts
index 2c3ca28cd..2f8de1963 100644
--- a/src/common/input/Keyboard.ts
+++ b/src/common/input/Keyboard.ts
@@ -46,7 +46,7 @@ export function evaluateKeyboardEvent(
     // Whether to cancel event propagation (NOTE: this may not be needed since the event is
     // canceled at the end of keyDown
     cancel: false,
-    // The new key even to emit
+    // The new key event to emit
     key: undefined
   };
   const modifiers = (ev.shiftKey ? 1 : 0) | (ev.altKey ? 2 : 0) | (ev.ctrlKey ? 4 : 0) | (ev.metaKey ? 8 : 0);
diff --git a/src/common/parser/EscapeSequenceParser.ts b/src/common/parser/EscapeSequenceParser.ts
index 868ab574f..9fffbcb4f 100644
--- a/src/common/parser/EscapeSequenceParser.ts
+++ b/src/common/parser/EscapeSequenceParser.ts
@@ -243,7 +243,7 @@ export const VT500_TRANSITION_TABLE = (function (): TransitionTable {
  *
  * This parser is currently hardcoded to operate in ZDM (Zero Default Mode)
  * as suggested by the original parser, thus empty parameters are set to 0.
- * This this is not in line with the latest ECMA-48 specification
+ * This is not in line with the latest ECMA-48 specification
  * (ZDM was part of the early specs and got completely removed later on).
  *
  * Other than the original parser from vt100.net this parser supports