in a good (also happy,etc.) hour: at a fortunate time; happily, fortunately: so in an evil (also ill,etc.) hour. †in good hour: in good time…

Unmodified. With that-clause: gratifying, fortunate, lucky; forming a matter for satisfaction or thankfulness. Also occasionally with if- or when-cl…

In as well. With that or if-clause or infinitive: advisable, desirable; = sense A. 2a(a).