adjective

• Disappearing, vanishing.
• (electromagnetism) Of an oscillating electric or magnetic field: not propagating as an electromagnetic wave but having its energy spatially concentrated in the vicinity of its source.
• (mathematics) Of a number or value: diminishing to the point of reaching zero as a limit; infinitesimal.
• Barely there; almost imperceptible.
• Ephemeral, fleeting, momentary.
• (botany) Of plant parts: shed after a period.