fluctuation

swing

Suspended recreational seat

• shiftMovement or work period
• instabilityTendency toward unpredictable change
• volatilityRapid, unpredictable changeability

unpredictability · capriciousness · fickleness · temperament · moodiness · emotional · mercurial · erratic · changeable · lability

oscillation

Repeated back-and-forth movement

• amplitudeMaximum oscillation displacement
• frequencyRate of recurrence
• vibrationRapid oscillating movement

harmonic · resonance · periodicity · sine · cycle · pendulum · modulation · pulsation · undulation · waveform

deviation

Departure from expected path

• varianceSpread around the mean
• variabilityTendency to change
• divergenceSeparation from common origin

dispersion · range · spread · differential · inconsistency · irregularity · anomaly · outlier · scatter · tolerance

recession

Prolonged economic decline

• expansionIncrease in scope
• contractionReduction in size
• slowdownReduction in pace

prosperity · depression · inflation · deflation · boom · bust · downturn · upturn · correction · rally

pulse

Arterial blood throb

• cadenceRhythmic pulse or pattern
• tempoRate of musical performance
• beatRhythmic pulse or strike

cycle · ebb · flow · surge · wax · wane · tidal · seasonal · circadian · diurnal

reading

Interpreting written text

• levelHorizontal or uniform position
• gaugeStandard of measurement
• meterDevice that measures usage

sensor · monitoring · tracking · recording · calibration · accuracy · precision · error · uncertainty · noise

• variabilityvariance, standard deviation, spread, dispersion, range
• changeabilityvariability, mutability, fickleness, inconstancy, instability
• cycleslife cycle, cycle, circle of life, cycles, period
• instabilityinstability, unsteadiness, shakiness, wobbliness, precariousness
• price changesprice drop, price surge, price swing, markup, markdown
• temperature changestemperature drop, heat waves, temperature rise, cold snaps, temperature spike