STEP Hebrew Lexicon: עָלַם

1) to conceal, hide, be hidden, be concealed, be secret

1a) (Qal) secret (participle)

1b) (Niphal)

1b1) to be concealed

1b2) concealed, dissembler (participle)

1c) (Hiphil) to conceal, hide

1d) (Hithpael) to hide oneself