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A sighting device or pointer for determining directions or measuring angles, used in surveying and (formerly) astronomy.
- ‘Both the alidades and the straight edges of the quadrant are fitted with viewers.’
- ‘A wide variety of alidades and plane tables are available, both in manual and electronic versions.’
- ‘In the circle an index on the alidades gives the angle that they form with the vertical diameter.’
- ‘A pointer, called an alidade, was pivoted at the centre of the disk.’
- ‘Telescopic alidades came into use in Europe in the early 1800s, and were soon introduced to American practice.’
Late Middle English: directly or (in modern use) via French and Spanish from Arabic al-‘iḍāda the revolving radius, probably based on aḍud upper arm.
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The definitions of ‘buddy’ and ‘bro’ in the OED have recently been revised. We explore their history and increase in popularity.