The crossword solution for the term 'PREFIX MEANING 'ACROSS'' is 'TRANS'. The prefix 'trans-' is derived from Latin and is used to indicate movement or change across a boundary. It is commonly used in English to describe something that is located on the other side of a physical boundary, such as a river or mountain range. It can also be used to describe a change in state or condition, such as a transition from one form to another.