| Word/Term | Meaning |
| Analogue clock | A clock which tells the time using an hour hand to indicate the hour and a minute hand to indicate minutes to and past the hour. |
| Capacity | The term used when measuring how much fluid fits inside a container. Measured in millilitres and litres. |
| Circle | A 2D shape with one curved face and no vertices. |
| Clockwise and anti-clockwise | A way of indicating the direction of a turn. Clockwise involves a turn to the right as if following the hands of a clock, anti-clockwise involves a turn to the left, against the direction of a clock’s hands. |
| Cone | A 3D shape with two faces, one circular, one edge and one vertex. |
| Converting into the same units | Understanding the connection between units of measurement and how they can be converted one to another. For example, length can be measured in centimetres or metres; there are 100cm in a metre. |
| Degree | The unit of measurement for angles and also for temperature. Represented by the symbol ° for angles (e.g. 90°) or °C (degrees Centigrade) and °F (degrees Fahrenheit) for temperature. |
| Digital clock | A clock which tells the time using numbers only. |
| Cone | A 3D shape with two faces, one circular, one edge and one vertex. |
| Cube | A 3D shape with six square faces, 12 edges and eight vertices. |
| Cuboid | A 3D shape with six faces, some or all of which are rectangular, 12 edges and eight vertices. |
| Corner | Also known as a vertex. The place on a 3D shape where three faces meet. Also used to describe the angles of a 2D shape. |
| Cylinder | A 3D shape with two circular faces, one rectangular face, two edges and no vertices. |
| Diagonal | A straight line that joins two vertices of a shape that are not next to each other. |
| Edge | The place on a 3D shape where two faces meet. |
| Face | Any flat surface of a 3D shape. Faces can be flat or curved and of many different shapes. |
| Geometry | The study of shape, position and movement. Includes such aspects as 2D and 3D shapes, angles, symmetry, pattern, tessellation, turns and position. |
| Hexagon | 2D shape with six sides and six vertices. |
| Horizontal | A horizontal line runs from left to right joining equivalent points on two opposite sides of a shape. |
| Irregular shapes | 2D shapes whose sides and angles are not all the same |
| Mass | This refers to the weight of an object. It is measured in grams (g) and kilograms (kg). |
| Measurement | In Maths, children learn about different forms of measurement, including length, weight (mass), capacity, time and temperature. |
| Mirror line | A line which can be drawn onto a shape to show that both sides have exact reflective symmetry. |
| Net | What a 3D shape would look like if it was opened out flat. |
| Octagon | A 2D shape with eight sides and eight vertices. |
| Pentagon | A 2D shape with 5 sides and 5 vertices. |
| Prism | A 3D shape with flat sides and identically shaped end faces. The cross section of a prism is the same all the way through. Examples are a triangular prism and a hexagonal prism. |
| Pyramid (square- based) | A 3D shape with 4 triangular faces, one square face and 5 vertices. |
| Pyramid (triangular-based) | A 3D shape with 4 triangular faces and four vertices. |
| Quadrilateral | Any shape with four sides. |
| Rectangle | A 2D shape with four straight sides and four right angles. Opposite sides are the same length. |
| Reflection of shapes | Drawing the reflection of a shape in a mirror line means drawing the shape on the other side of the line as if it has been flipped over the line. |
| Reflective symmetry | When a shape or pattern is reflected in a mirror line or line of symmetry. The reflected shape will be an exact mirror image of the original, the same size and the same distance from the mirror line. |
| Regular shapes | 2D shapes with closed sides, where all sides are the same length and all angles are the same. |
| Right angle | An angle of exactly 90°. The two lines which make a right angle are perpendicular. |
| Side | One of the lines, straight or curved, which encloses a 2D shape. |
| Sphere | A 3D shape with one curved face, no edges and no vertices. |
| Square | A 2D shape with four equal sides, four vertices and four right angles. |
| Triangle | A 2D shape with three straight sides and three vertices. Can be equilateral, isosceles, right-angled or scalene. |
| Turns | A movement in a space, either clockwise or anticlockwise. A quarter turn is 90°, a half turn is 180°, a three-quarter turn is 270° and a full turn is 360°. |
| Vertex/vertices | Also known as corner/s. The place on a 3D shape where three faces meet. Also commonly used to describe the corners of a 2D shape. |
| Vertical | A line which runs up and down a page or shape, from top to bottom. It will intersect a horizontal line at right angles. |
| Volume | The amount of space taken up by an object. |
| 2D shapes | Shapes which are flat, having only two dimensions – height/length and width. |
| 3D shapes | Shapes which have a solid form, having 3 dimensions – height/length, width and depth. |
| 24 hour clock | The 12 hour clock runs from 1 o’clock to 12 o’clock twice per day. The 24 hour clock runs from 00:00 hours (midnight or 12.00 am) through 24 hours to 23:59 (11.59 pm). |
