lacking a pilot or needing no pilot: pilotless aircraft.
having no pilot light: a pilotless furnace.

1595–1605; pilot + -less

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
It would be cheaper than a pilotless drone, for one thing, though not necessarily smarter.
Civilian usage of pilotless planes has been slow to take off.
Many gas ranges offer pilotless ignition systems with a sealed burner.
His pilotless aircraft research is what he called it.
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