'enter freely' is correct and usable in written English.
You can use this phrase when you want to give someone permission to enter a place without limitations. For example, "Please, enter freely and make yourself at home."
In one room, which the birds could enter freely, was a length of wire and a cylindrical container that had something tasty, like a piece of pig's heart, at the bottom.
Though the lobby is visible from the street outside through big glass doors, a sign states "guests only", giving the feeling of a private members' club rather than a conventional hotel; guests can enter freely with their room key.
Since his wife was an Iraqi citizen, he expected to enter freely, but the Iraqi authorities allowed only her to leave custody; he and the children remain in a school building under guard.
Critics said he had neglected conservation.See article: Mr Bush's new energy planThe United States and Britain drafted a new resolution on sanctions against Iraq, to limit imports with a military use even more strictly but allowing all others to enter freely while retaining financial control.
On November 23rd the home secretary, Theresa May, defused matters with a clever plan to cut headline numbers from April while relaxing the regime for specific categories of workers.About half of Britain's long-term immigrants are Europeans entitled to enter freely.
Self-culture demanded "a manifold of situations" (eine Mannigfaltigkeit der Situationen) for the individual citizens, so that they would be able to enter freely into relationships of association and cooperation with one another, because, Humboldt argued, humans can realize their potential as individuals only in society.
I needed investment to be able to create music full-time – in other words, the publisher's investment would promote innovation – and so I entered freely into this agreement.
On "60 Minutes," she told Anderson Cooper that she was physically threatened by an unknown Trump surrogate in 2011; what she alleges amounts to extortion, which would imply that she may not have entered freely into her 2016 contract.
Although the meat in all of the flasks putrefied, he found that only in the open and uncovered flasks, which flies had entered freely, did the meat contain maggots.
They enter water freely and appear to enjoy bathing.
The two nations joined the European Union in 2007, and their citizens are already allowed to enter Britain freely for visits.
