oscillate
verb
os·cil·late
ˈä-sə-ˌlāt 
oscillated; oscillating
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.
Examples of oscillate in a Sentence
Recent Examples on the Web
This allows lithium ions to oscillate and redistribute more evenly, thereby improving their entry into the anode material.
—Sujita Sinha, Interesting Engineering, 14 Jan. 2026
An inconsistent scorer who oscillated between starting and the bench for the better part of four years.
—Joseph Dycus, Mercury News, 9 Jan. 2026
But Minnesota’s performances over the season’s first two and a half months consistently oscillated between awesome and awful.
—Jace Frederick, Twin Cities, 9 Jan. 2026
An oscillating multi-tool is better for large jobs, and it can also be used for other projects.
—Lee Wallender, The Spruce, 5 Jan. 2026
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Cite this Entry
“Oscillate.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/oscillate. Accessed 19 Jan. 2026.
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
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
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