To conclude, the term 'to conclude' can be expressed in a variety of ways. The 6-letter solution is 'LASTLY', which implies that something is coming to an end. The 4-letter solution is 'ERGO', which is a Latin word meaning 'THEREFORE' or 'HENCE'. Finally, the 5-letter solution is 'insum', which is a Latin word meaning 'in sum', or 'in conclusion'. All three solutions indicate that something is coming to an end, and that a conclusion has been reached.