The crossword solution for the term 'WITH, TO HENRI' is 'AVEC', which is a French word meaning 'WITH'. It is commonly used to indicate that someone is doing something WITH another person or group. For example, one might say 'Je vais AVEC Henri' ('I'm going WITH Henri'). It can also be used to indicate accompaniment, such as 'Je vais AVEC la musique' ('I'm going WITH the music'). In this context, it implies that Henri is doing something WITH someone else.