1) Acceptable 2) Conceded or permitted 3) Gave the go-ahead 4) Gave the okay 5) Gave way 6) Granted as a trade-in 7) Kosher 8) Legal 9) Let it go 10) Licit 11) Not forbidden 12) Okay 13) Okayed 14) Permissable 15) Permitted 16) Took into account 17) Within the rules 1) Authorized 2) Enabled 3) Free 4) Kosher 5) Legal 6) Let 7) Licit 8) Official 9) Permitted 
• (imp. & p. p.) of Allow
allowed (uh LOUD) 1. Permit someone to do something; let, give permission to; authorize, concede to, sanction, agree to, approve: 'My salary does not allow me to live extravagantly. The teacher allowed us to leave school early.' 2. Allocate, assign, grant, provide: 'Allow yourself at least an hour to get to the airport.'
involving a change in quantum numbers, permitted by the selection rules: allowed transition.