The word "noticeable" refers to something that is easily seen or perceived; it stands out in some way and can be readily observed. For example, a noticeable change in weather may be a dramatic shift from sunny to rainy.
The word "noticeable" is derived from the root word "notice," meaning to observe or pay attention to something. The suffix "-able" indicates that something can be done, so "noticeable" essentially means that something can be noticed or easily seen. The term traces back to the Latin root "notitia," meaning knowledge or being known.