To help.

"This book will assist you in getting your life in order."

To make a pass that leads directly towards scoring.

To help compensate for what is missing with the help of a medical technique or therapy.

To stand (at a place) or to (an opinion).

"A great part of the nobility assisted to his opinion."

To be present (at an event, occasion etc.).

Assistance; help given

Helpful; auxiliary (to).