'Open Sesame' definitions:

Definition of 'open sesame'

From: WordNet
noun
Any very successful means of achieving a result
noun
A magical command; used by Ali Baba

Definition of 'Open Sesame'

From: GCIDE
  • Sesame \Ses"a*me\, n. [L. sesamum, sesama, Gr. ????, ???: cf. F. s['e]same.] (Bot.) Either of two annual herbaceous plants of the genus Sesamum (Sesamum Indicum, and Sesamum orientale), from the seeds of which an oil is expressed; also, the small obovate, flattish seeds of these plants, sometimes used as food. See Benne. [1913 Webster]
  • Open Sesame, the magical command which opened the door of the robber's den in the Arabian Nights' tale of "The Forty Thieves;" hence, a magical password.
  • Sesame grass. (Bot.) Same as Gama grass. [1913 Webster]