Merriam-Webster - eclipse: 1a : the total or partial obscuring of one celestial body by another
On earth, at this moment in time, we're treated to a very privileged type of solar eclipse, an almost exact and total solar eclipse. Hasn't always been this way, and it won't be much longer, as the moon is slowly moving away from earth, and has been from the beginning.
In astronomy, a transit (or astronomical transit) is a phenomenon when a celestial body passes directly between a larger body and the observer. As viewed from a particular vantage point, the transiting body appears to move across the face of the larger body, covering a small portion of it.[1]
The word “transit” refers to cases where the nearer object appears smaller than the more distant object.
https://en.wikipedia.org/wiki/Transit_(astronomy)