Pride and prejudice . question about traditions .

greetings everyone :) I was reading the famous novel Pride and Prejudice - actually it is the first novel to read to be that old - anyways I've come through this when Lady Catherine asks Mrs Bennet if any of her younger sisters are *out* and she particularly replies this
``Yes, Ma'am, all.''
``All! -- What, all five out at once? Very odd! -- And you only the second. -- The younger ones out

Pride and prejudice . question about traditions .