slide rule: meaning, definition, pronunciation and examples
C2Technical / Historical
Quick answer
What does “slide rule” mean?
A mechanical analog computing device consisting of two logarithmic scales, one sliding within the other, used for rapid multiplication, division, and other calculations.
Audio
Pronunciation
Definition
Meaning and Definition
A mechanical analog computing device consisting of two logarithmic scales, one sliding within the other, used for rapid multiplication, division, and other calculations.
Any tool, method, or system considered outdated or superseded by modern technology; a symbol of pre-digital calculation and engineering.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. The object and its name are identical in both variants.
Connotations
In both, it connotes mid-20th century engineering, mathematics, and science education before electronic calculators.
Frequency
Equally low frequency in both varieties, used almost exclusively in historical or metaphorical contexts.
Grammar
How to Use “slide rule” in a Sentence
[Subject] uses/used a slide rule[Subject] is a slide rule for [Metaphorical Target]Vocabulary
Collocations
Examples
Examples of “slide rule” in a Sentence
adjective
British English
- The slide-rule engineers designed the Concorde. (hyphenated attributive)
American English
- He had a slide rule mentality, valuing precision above speed.
Usage
Meaning in Context
Business
Metaphorical: 'Their budgeting process is like using a slide rule in the age of AI.'
Academic
Historical context in history of science, technology, or engineering education.
Everyday
Rare. Used by older generations recalling their training: 'We had to learn on slide rules.'
Technical
Precise description of the device, its scales (C, D, A, B, K, CI, etc.), and operation for historical accuracy.
Vocabulary
Synonyms of “slide rule”
Strong
Neutral
Weak
Vocabulary
Antonyms of “slide rule”
Watch out
Common Mistakes When Using “slide rule”
- Misspelling as 'sliderule' or 'slide-rule' (though hyphenated form is sometimes seen).
- Using it to refer to a standard ruler.
- Pronouncing 'rule' as /raʊl/ instead of /ruːl/.
FAQ
Frequently Asked Questions
No. A ruler is a straightedge for measuring length or drawing lines. A slide rule is a calculating device with logarithmic scales that slide past each other.
The slide rule was made largely obsolete in the 1970s by the widespread availability of affordable, portable electronic calculators and later by computers.
Yes, they are sold as collector's items, novelty gifts, or educational tools to demonstrate principles of logarithms, though they are no longer standard equipment.
For historical interest, as a hands-on way to understand logarithmic relationships, or as a backup calculation method in contexts without electricity or digital devices.
A mechanical analog computing device consisting of two logarithmic scales, one sliding within the other, used for rapid multiplication, division, and other calculations.
Slide rule is usually technical / historical in register.
Slide rule: in British English it is pronounced /ˈslaɪd ˌruːl/, and in American English it is pronounced /ˈslaɪd ˌrul/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “[Person/Thing] is a human slide rule (extremely fast at mental arithmetic)”
- “the slide rule generation”
Learning
Memory Aids
Mnemonic
SLIDE RULE: SLIDing scales RULEd calculation before microchips.
Conceptual Metaphor
OUTDATED TECHNOLOGY IS A SLIDE RULE (e.g., 'That software is the slide rule of database management.').
Practice
Quiz
In a modern metaphorical context, calling a piece of technology 'a slide rule' implies that it is: