Used when including an item as part of a larger collection or document.

Part of Whole

Indicates putting in extra information that was not previously there.

Additional Input

Emphasizes the action of making something part of a sequence or process.

In cooking, it often refers to the order in which ingredients should be mixed.

Implies slowly incorporating an ingredient into a dish to avoid clumping.

In math, 'add in' is about being precise and including all parts for accurate results.

Means considering all necessary factors in a mathematical estimation or prediction.