oscillate

verb

os·​cil·​late ˈä-sə-ˌlāt 

oscillated; oscillating

intransitive verb

1

a

: to swing backward and forward like a pendulum

The fan was oscillating.

b

: to move or travel back and forth between two points

he oscillates regularly between his comfortable home … and his downtown office-laboratory

—Gladwin Hill

2

: to vary between opposing beliefs, feelings, or theories

The mood of the voters has oscillated between optimism and pessimism.

3

: to vary above and below a mean value

Bank rate oscillates between 2 and 6 percent.

oscillatory

ˈä-sə-lə-ˌtȯr-ē 

adjective

Choose the Right Synonym for oscillate

swing, sway, oscillate, vibrate, fluctuate, waver, undulate mean to move from one direction to its opposite.

swing implies a movement of something attached at one end or one side.

the door suddenly swung open

sway implies a slow swinging or teetering movement.

trees swaying in the breeze

oscillate stresses a usually regular alternation of direction.

an oscillating fan

vibrate suggests the rapid oscillation of an elastic body under stress or impact.

the vibrating strings of a piano

fluctuate suggests constant irregular changes of level, intensity, or value.

fluctuating interest rates

waver stresses irregular motion suggestive of reeling or tottering.

the exhausted runner wavered before collapsing

undulate suggests a gentle wavelike motion.

an undulating sea of grass

Examples of oscillate in a Sentence

Recent Examples on the Web

Under Bob Melvin, his manager with both the A’s and Padres, Manaea won’t have to worry about oscillating roles. —Justice Delos Santos, The Mercury News, 27 Nov. 2024

But few of the directors who would join V/H/S over the years that followed introduced a more memorable creature — a birdlike demon who oscillates from purring affection to ravenous rage — or so skillfully tracked the running bodies captured by a running camera. —A.a. Dowd, Vulture, 9 Oct. 2024

Organizations often oscillate between these two extremes. —Sherzod Odilov, Forbes, 26 Nov. 2024

The minimum weekly play for these types of movies typically oscillates between 1,500 to 3,500 a week, but Chabert is a bigger name and is sure to make significantly more than that. —Lissete Lanuza Sáenz, StyleCaster, 18 Nov. 2024

Word History

Etymology

Latin oscillatus, past participle of oscillare to swing, from oscillum swing

First Known Use

1726, in the meaning defined at sense 1a

Kids Definition

oscillate

verb

os·​cil·​late ˈäs-ə-ˌlāt 

oscillated; oscillating

1

a

: to swing backward and forward like a pendulum

b

: to move or travel back and forth between two points

2

: to have trouble deciding between opposing beliefs, feelings, or ideas

oscillatory

ˈäs-ə-lə-ˌtōr-ē 

-ˌtȯr-

adjective

Medical Definition

oscillate

intransitive verb

os·​cil·​late ˈäs-ə-ˌlāt 

oscillated; oscillating

1

: to swing backward and forward like a pendulum

2

: to move or travel back and forth between two points

oscillatory

ˈäs-ə-lə-ˌtōr-ē, -ˌtȯr- 

adjective