Noun choice: identify the correct word to mean something added to a collection Context: A new book will improve the holdings of a library. Complete the sentence: "This book is a useful ______ to our library." Choose the correct option.

Given data

• We describe a new item joining a collection (library).

Concept/Approach
Addition = something added to an existing set. Edition = a particular version of a book. Additive = a substance added to something else (chem./food). Adjunction = the act of joining (rare in everyday usage).

Option analysis
addition — correct collocation: “a useful addition to our library.” ✅edition — wrong meaning (version/printing).additive — wrong part of speech/semantic field.adjunction — overly technical; not idiomatic here.

Final Answer
addition