This is the 8807th most frequent Turkish word.
seyir
"Observation," "viewing," or "voyage."
In this context, 'seyir' refers to the 'course or journey' of the sea as observed.
Gemiden denizin seyri muhteşem görünüyordu.
The view of the sea's course from the ship looked magnificent.
In this usage, 'seyir' refers to 'viewing or watching', particularly in the context of watching a movie.
Film seyri sırasında dikkatlice incelemeler yaptım.
During the viewing of the film, I made careful observations.
Here, 'seyir' is used to describe the 'course or progress' of a development, in this case, a medical condition.