diagonal - Master This Word
Master this word with our 5-step learning method – Learn English in English
diagonal Word Meanings
- a line connecting two non-adjacent corners of a polygon
- situated at an angle between two lines
- a way of describing something that crosses or cuts through
diagonal Example Sentences
Example sentences are the start of understanding. Don't rush to memorize. First feel how the word works in a sentence.
diagonal Phonetic & Pronunciation
UK
/daɪˈæɡ.ən.əl/
US
/daɪˈæɡ.ə.nəl/
diagonal Word Etymology
diagonal = dia- (across) + gon (angle). From Latin 'diagonalis' → Old French 'diagonal' → English. Imagine a line stretching across a square, connecting corners in a dance, symbolizing movement across boundaries.
Note 1: These definitions and etymologies are not standard dictionary definitions, but extended explanations provided to help with memorization and understanding of the actual application of words. Through this background information, we strive to make words more vivid and easier to understand, and help you remember their meanings in real life.
Note 2: LexiTalk designs the learning flow around the linguistics principle of “Comprehensible Input.” When learners encounter material that is slightly above their level but still understandable from context, the brain naturally absorbs the language. That’s why we keep every word inside authentic contexts, using examples and associations to help you understand it and use it flexibly.
Read the FAQ explanation of Comprehensible InputReal Context
Diagonal is a word with two major uses. As a noun, it designates a line that connects two non-adjacent corners of a polygon, such as the diagonal of a square, which cuts across the interior rather than along a edge. As an adjective, diagonal describes something that lies at an angle to a baseline or between two lines, often slanting or oblique. In everyday language, diagonal can also describe metaphorical crossings or unexpected paths that seem to cut through a situation. The term comes from Latin and French roots meaning across the angle, reinforcing the sense of movement from one side to another rather than following the boundary.
Usage Reminders
- Diagonal can be a noun or an adjective.
- Use it for a line across a polygon, not along an edge.
- Talk about the length of the diagonal in geometry.
- Describe oblique or crossing directions with diagonal, not just any slant.
- In metaphor, diagonal implies crossing boundaries or moving across a situation.
Common Misconceptions
- A diagonal is the same as a side of the polygon.
- All diagonals are perpendicular to sides.
- A diagonal only exists in squares or rectangles.
- Diagonals must always lie entirely inside a polygon.
- Diagonal always means something negative or secret.
Thinking Differences
Explain to an English speaker: diagonal serves as both a precise geometric term and a metaphor; learners should keep geometric meaning separate from casual slant/oblique language.
Learning Tips
- Pronounce: di-AG-uh-nal with stress on the second syllable.
- Differentiate noun vs adjective usage with examples.
- Link diagonal to interior lines, not outer boundaries.
- Practice with squares, rectangles, and polygons of various shapes.
- Compare diagonal to oblique and slanted to build nuance.
- Use diagonals in diagrams and data visuals to show crossing paths.
5-Step Learning Method - Learn English in English
Step 1: Meaning
What is the meaning of 'diagonal'?
A.A line at a sharp angle to the edges of a shape
B.An object that moves sideways
C.A straight line between two opposite corners of a shape
D.A circular pattern
Step 2: Usage
Which sentence uses 'diagonal' correctly?
A.The cat jumped across the diagonal of the room.
B.I prefer my diaganol pizza slice with extra cheese.
C.She drew a diagonal line to separate the two sections.
D.He sat in a diagonal position in the chair.
Step 3: Similar Words
Which word is most similar to 'diagonal'?
A.Straight
B.Slanting
C.Vertical
D.Horizontal
Step 4: Opposite Words
What is the opposite of 'diagonal'?
A.Perpendicular
B.Straight
C.Curved
D.Horizontal
Step 5: Mastery
Can you think of a real-life context involving this word?
A.The kids arranged the blocks in a continuous line.
B.She noticed the shelves were placed in a diagonal arrangement.
C.The architect designed the building with windows at a slant.
D.He noticed how the floor tiles were laid in a cross pattern.
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