What is formula definition in Google Sheets?
Formula Definition extends Google Sheets named functions: reusable custom formulas with placeholders and shared definitions. They let teams package logic without repeating long lambda blocks.
When to use it
Use named function concepts when the same custom formula appears in many workbooks and needs a stable name.
When to skip it
Skip named functions when a short LET block in one file is easier to maintain.
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Read post →Related terms
Named function
A named function is a custom formula you define once and call by a friendly name in any cell. Google Sheets uses LAMBDA under the hood via Data > Named functions. Instead of repeating a long expression, you write =DISCOUNT(price, rate) everywhere. Named functions make templates readable and reduce copy-paste errors across tabs.
Read guide →LAMBDA
LAMBDA defines an anonymous function inside a formula. You name parameters, write the calculation, then pass arguments when you call it. Combined with MAP, BYROW, or a named LAMBDA in the Name manager, it replaces fragile copy-paste logic across big tables.
Read guide →Google Sheets formulas
A formula is an instruction in a cell that calculates a result from other cells, ranges, or built-in functions. Every formula begins with =. When inputs change, the sheet recalculates so dashboards and models stay live without manual copy-paste. Formulas are the default automation layer inside the grid before Apps Script or add-ons.
Read guide →Done reading about formula definition?
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