What one party adds to a common thing. A contribution is named from the giving side and measured on the common one.

That which keeps a thing, and the one with standing over it. Holding is not the same as owning.

To put a thing forward for another to take or leave. An offer that cannot be refused is not one.

To make available what another needs — supply as a kept promise.

To give while keeping — the gift that divides nothing; opt-in by law in this house, both directions.

Able to hold difference without breaking — accepting variation by design; of systems, forgiving of the unexpected.