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The phrase "at closest" is not standard in written English and may cause confusion.
It could be used in contexts where you want to indicate the nearest possible distance or proximity, but it is better to use more common expressions.
Example: "The two buildings are at closest a hundred meters apart."
Alternatives: "at nearest" or "at the closest distance".
Exact(33)
At closest approach, the stars are about as far apart as Mars is from the sun.
The spacecraft will orbit the Sun at 8.5 solar radii from the Sun's surface at closest approach.
We manipulated two complexity factors, convergence angle and aircrafts minimum distance at closest approach, in a multidimensional workload assessment method based on psychophysiological, performance, and subjective measures.
At closest point - Measurement in observed direction closest to the specified column direction; the specified direction does not have four nearest measurement directions suitable for interpolation.
At closest approach, New Horizons will be less than 12,500km above the dwarf planet's icy surface, but 4.5bn kilometres from Earth.
Longitudinal distribution of benthic invertebrates partially fitted to predictions for glacierized temperate systems, with Diamesinae spp. dominating at closest sites to the Cónico, and Orthocladiinae increasing downstream, but patterns were unclear at Torrecillas.
Similar(27)
And we're watching at close quarters.
Jones does things at close range.
There would be fighting at close quarters.
Describes observing elephants at close range.
I don't mean at close hand.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com