If an object oscillates, it moves repeatedly from one position to another and back again, or keeps getting bigger and smaller. I checked to see if the needle indicating volume was oscillating. + oscillation oscillations os·cil·la·tion Some oscillation of the fuselage had been noticed on early flights
{f} vary regularly between two positions; vacillate between two opinions; fluctuate between high and low values; swing predictably between two extremes
If the level or value of something oscillates between one amount and another, it keeps going up and down between the two amounts. Oil markets oscillated on the day's reports from Geneva. an oscillating signal of microwave frequency. = fluctuate + oscillation oscillations os·cil·la·tion There have always been slight oscillations in world temperature
If you oscillate between two moods, attitudes, or types of behaviour, you keep changing from one to the other and back again. The president of the Republic oscillated between a certain audacity and a prudent realism. + oscillation os·cil·la·tion that perpetual oscillation between despair and distracted joy
be undecided about something; waver between conflicting positions or courses of action; "He oscillates between accepting the new position and retirement"