simultaneously

Everyday

1. At exactly the same time. tree →
2. (maths) «Solve simultaneously»: find values that make two or more equations true together. tree →

In the lessons

In maths problems about two things happening at once (two taps fill a tank simultaneously, two trains leave simultaneously) — their rates or amounts are usually added or compared. In algebra, «simultaneous equations». In everyday life, doing two things at once. Formal; everyday words are «at the same time» or «at once».

Examples

• The two runners crossed the line simultaneously. tree →
• Two taps fill the bath simultaneously. tree →
• Don't all talk simultaneously! tree →
• The lights went on simultaneously in every room. tree →
• She can pat her head and rub her tummy simultaneously. tree →
• Solve the two equations simultaneously. tree →
• Both trains left the station simultaneously. tree →
• “What would Peter do?” they cried simultaneously. tree →

Note

Long word: si-mul-ta-ne-ous-ly. In maths: if two taps work simultaneously, add their rates (3 litres a minute plus 2 litres a minute = 5 litres a minute together). Things done simultaneously take the same time, not one after the other.