Spread
A spread is an arrangement of one or more card positions, with each position assigned a specific interpretive question or function.
A spread gives structure to a reading.
For example, AngelCards.info's default Three Card spread uses:
What is present?
What needs attention?
What may help?
The selected cards answer different questions because they occupy different positions.
A spread does not need to be physically elaborate.
A one-card reading technically contains one position.
A larger spread may contain many.
Good spread design uses meaningfully distinct positions rather than simply adding more cards.
Scope: Spread structure belongs to the reading method, not necessarily to the deck's permanent card meanings.