Sillage
The trail of scent a perfume leaves behind its wearer. In French, the same word means the wake of a ship.
Full definition of Sillage →:: COMPARE ::
SillagevsProjection
The short answer
Projection is how far the scent pushes outward from you right now. Sillage is what stays in the room after you have gone. One is a radius; the other is a history.
Side by side
| Aspect | Sillage | Projection |
|---|---|---|
| Concerns | What remains | What radiates |
| Measured | Behind you | Around you |
| Requires you present | No | Yes |
| French sense | A wake | — |
What each one means
Projection
The contrast above sets out how Projection differs from Sillage on the points that actually matter.