1. Plural of attosecond; units of time equal to one quintillionth of a second (10⁻¹⁸ seconds), used in physics and chemistry to measure extremely fast atomic and molecular processes.
Usage: technical; scientific; plural form

Examples

• Researchers used attosecond pulses to observe electron behavior in atoms.
• The laser produced bursts lasting only a few attoseconds.
• Attosecond spectroscopy allows scientists to study ultrafast chemical reactions.
• Modern technology can now measure events occurring in attoseconds.
• The experiment tracked electron motion on an attosecond timescale.