planetary

[ plan-i-ter-ee ]

adjective

1. of, relating to, or resembling a planet or the planets.
2. wandering; erratic.
3. terrestrial; global.
4. Machinery. noting or pertaining to an epicyclic gear train in which a sun gear is linked to one or more planet gears also engaging with an encircling ring gear.

noun

1. Machinery. a planetary gear train.

planetary

/ ˈplænɪtərɪ; -trɪ /

adjective

1. of or relating to a planet
2. mundane; terrestrial
3. wandering or erratic
4. astrology under the influence of one of the planets
5. (of a gear, esp an epicyclic gear) having an axis that rotates around that of another gear
6. (of an electron) having an orbit around the nucleus of an atom

noun

1. a train of planetary gears

Other Words From

• non·plane·tary adjective

Word History and Origins

Origin of planetary¹

From the Latin word planētārius, dating back to 1585–95. See planet, -ary

Example Sentences

The findings may significantly impact the way scientists approach planetary exploration, particularly for upcoming missions aimed at studying the habitability of Mars.

From Science Daily

"As we encroach on planetary boundaries, the number of organisms an ecosystem can support is reduced," says Prof Townend.

From Science Daily

"This is just a new way to look at it, towards planetary health."

From Salon

The ancient Persian paisley motif has long been a symbol for strength and fertility, and a brushed Zen circle filling one panel represents inner peace while doubling as a planetary emblem.

From Los Angeles Times

"The only way to get to that vision is with giant space stations. The planetary surfaces are just way too small."

From Salon

Related Words

• global
• terrestrial