The root is "ordinar."
3. provide—Latin pro (before) plus vid (to look or see)—to look before or ahead, to look out for in advance.
The root is "vid."
4. convention—Latin con (together) plus ven (to come) plus tion (act of)—act of coming together—meeting.
The root is "ven."
Many roots or bases are taken directly from the English:
1. out-come—act of coming out—that which comes out of something else—result.
2. in-side—inner side or surface.
3. cheer-ful—full of cheer.
4. happi-ness—state of being happy.