1. plural of trillionth; parts that are each one of a trillion equal divisions of something

Examples

• The measurement was accurate to within trillionths of a second.
• Scientists can now detect particles in trillionths of a gram.
• The laser pulse lasted only trillionths of a second.
• These instruments measure distances in trillionths of a meter.
• The reaction time was measured in trillionths of a second.
• Computer processors operate at speeds involving trillionths of a second.