To observe or watch (something).
to face (to be presented or confronted with; to have in prospect)
To consider.
To study (something) visually.
To notice or view, especially carefully or with attention to detail.
To take note of and celebrate (a holiday or similar occurrence); to follow (a type of time or calendar reckoning).
To comment on something; to make an observation.
To follow or obey the custom, practice, or rules (especially of a religion).