4:5 How is the word "moderation" defined here?

Moderation means equitable, fair, mild, gentle; to be lenient, yielding, unassertive (cp 1Ti 3:3; Tit 3:2; Jas 3:17; 1Pe 2:18).

In Php 4:5 it is used as a noun, meaning forbearance, gentleness, tolerance, clemency.

The Lord is at hand means that the Lord will be coming soon.