noun / verb
notice
NOH-tis/ˈnəʊtɪs/
Awareness of or attention to someone or something.
He notices a ladybug on the leaf while watering the plant.

Etymology
Latin notitia meant knowledge or being known. The English noun developed the sense “heed” or “cognizance,” and the verb came to mean taking notice of something—becoming aware of it.
In context
These deflections are tiny and we don't notice them in daily life, but careful experiments reveal them.
More examples
- Her careful work came to the manager's notice.
- I had not noticed the missing button.
- The unusual sound attracted our notice.
Forms
notice · notices · noticed · noticing
noticeable adjective — Easy to see or become aware of