Is element search in a dictionary always an operation with constant complexity O(1)?

Searching for an element in a dictionary (for example, in Dictionary<TKey, TValue> in C#) typically has an amortized complexity of O(1), meaning the operation is performed in constant time on average. However, in the worst case, if there are many hash collisions and elements are chained in a single bucket, the complexity can degrade to O(n), where n is the number of elements.

Therefore, search is not always guaranteed to be O(1), but in practice, thanks to good hashing and collision distribution, it is very close to constant time.