diff --git a/include/ISceneNode.h b/include/ISceneNode.h
index 0887cd6e..8d99d272 100644
--- a/include/ISceneNode.h
+++ b/include/ISceneNode.h
@@ -65,7 +65,7 @@ namespace scene
 
 		//! This method is called just before the rendering process of the whole scene.
 		/** Nodes may register themselves in the render pipeline during this call,
-		precalculate the geometry which should be renderered, and prevent their
+		precalculate the geometry which should be rendered, and prevent their
 		children from being able to register themselves if they are clipped by simply
 		not calling their OnRegisterSceneNode method.
 		If you are implementing your own scene node, you should overwrite this method
diff --git a/include/matrix4.h b/include/matrix4.h
index 3f67ac57..6dc146cc 100644
--- a/include/matrix4.h
+++ b/include/matrix4.h
@@ -2057,7 +2057,7 @@ namespace core
 		core::vector3df v(vs);
 		v.normalize();
 
-		// cosinus angle
+		// cosine angle
 		T ca = f.dotProduct(t);
 
 		core::vector3df vt(v * (1 - ca));
@@ -2118,7 +2118,7 @@ namespace core
 		// axis multiplication by sin
 		const core::vector3df vs = look.crossProduct(from);
 
-		// cosinus angle
+		// cosine angle
 		const f32 ca = from.dotProduct(look);
 
 		core::vector3df vt(up * (1.f - ca));
diff --git a/include/vector3d.h b/include/vector3d.h
index 72b34556..42ab86ab 100644
--- a/include/vector3d.h
+++ b/include/vector3d.h
@@ -155,7 +155,7 @@ namespace core
 
 		//! Calculates the cross product with another vector.
 		/** \param p Vector to multiply with.
-		\return Crossproduct of this vector with p. */
+		\return Cross product of this vector with p. */
 		vector3d<T> crossProduct(const vector3d<T>& p) const
 		{
 			return vector3d<T>(Y * p.Z - Z * p.Y, Z * p.X - X * p.Z, X * p.Y - Y * p.X);
diff --git a/source/Irrlicht/COBJMeshFileLoader.cpp b/source/Irrlicht/COBJMeshFileLoader.cpp
index 4e62562c..6649b7bc 100644
--- a/source/Irrlicht/COBJMeshFileLoader.cpp
+++ b/source/Irrlicht/COBJMeshFileLoader.cpp
@@ -420,7 +420,7 @@ COBJMeshFileLoader::SObjMtl* COBJMeshFileLoader::findMtl(const core::stringc& mt
 		Materials.getLast()->Group = grpName;
 		return Materials.getLast();
 	}
-	// we found a new group for a non-existant material
+	// we found a new group for a non-existent material
 	else if (grpName.size())
 	{
 		Materials.push_back(new SObjMtl(*Materials[0]));
diff --git a/source/Irrlicht/COpenGLDriver.h b/source/Irrlicht/COpenGLDriver.h
index 32e4f324..9d82e437 100644
--- a/source/Irrlicht/COpenGLDriver.h
+++ b/source/Irrlicht/COpenGLDriver.h
@@ -443,7 +443,7 @@ namespace video
 		core::matrix4 Matrices[ETS_COUNT];
 		core::array<u8> ColorBuffer;
 
-		//! enumeration for rendering modes such as 2d and 3d for minizing the switching of renderStates.
+		//! enumeration for rendering modes such as 2d and 3d for minimizing the switching of renderStates.
 		enum E_RENDER_MODE
 		{
 			ERM_NONE = 0,	// no render state has been set yet.