1) an act of appearing (appearance)

2) based on convention (and so sometimes appearing insincere) (conventional)

3) the time between the sun or light appearing and disappearing (day)

4) (a spirit of) a dead person appearing to a person still living (ghost)

5) being or appearing unfriendly (hostile)

6) a soft, green growth appearing on damp surfaces, bread etc; a hollow container into which a liquid substance is poured to set into a desired shape (mould)

7) occurring or appearing at regular intervals (periodic)