What does this afternoon mean?
This afternoon means either “later today in the afternoon” (when said in the morning), “earlier today in the afternoon” (when said in the evening), or “now” (when said when the afternoon in question is in progress).
What did you think of the careers event this afternoon? [Speaking in the evening]
I’m delighted to welcome you all here this afternoon. [Speaking during the event]
On a related note, what time is afternoon sometimes depends on the context. Someone who is still at work at 6 p.m when it is light outside might consider it to be “late afternoon” rather than “early evening,” for instance.
Have you tried QuillBot’s free Grammar Checker? It will help you to pick up typos such as writing “good afternoon” as one word instead of two, for instance.