1. adjective
a) Courageous, daring.
It would be extraordinarily bold of me to give it a try after seeing what has happened to you.
b) having thicker strokes than the ordinary form of the typeface
The last word of this sentence is bold.
See Also: embolden
2. verb
To make a selected portion of text have a typeface with thicker and heavier strokes.
Wikipedia foundation.