I went to Charleston on Thursday, and <span style="background-color:#cc99ff;">came back the following Monday</span>.<br/>We'll meet on Monday.<br/>(informal) We'll <span style="background-color:#ff99cc;">meet Monday</span>.<br/><a href="http://oaadonline.oxfordlearnersdictionaries.com/dictionary/monday"><a href='http://oaadonline.oxfordlearnersdictionaries.com/dictionary/monday' target='_blank' rel='nofollow'>http://oaadonline.oxfordlearnersdictionaries.com/dictionary/monday</a> </a><br/><br/><span style="background-color:#ff99cc;">meet Monday</span> sounds informal, doesn't it? Does <span style="background-color:#cc99ff;">came back the following Monday</span> sound informal too? Is <span style="background-color:#cc99ff;">came back <span style="background-color:#ffff99;">on</span> the following Monday</span> less informal?