Retired publisher. Live in England & SW France. Love books, people, pies & dogs. Amateur rigger & photographer, muse @kianakraze. Like gladiator/thong sandals.
@Seraphinaf5 71, but the question is ambiguous. Does he enter together with 100 people, or enter a room where there are are already 100 people, making 101?
@PatsKam Use it and then spend five minutes explaining what it means. It’s obsolete - I’m over 70, native British English speaker & have never heard it in conversation.