Truthfully, to tell the truth, in fact.

written down on e.g. paper. / published in e.g. a magazine or newspaper. / (of a book) available for purchase from the publisher. If a book is out of print all copies have been sold.

Theoretically.

Currently being used. / (archaic) Used; accustomed.

in a dangerous position or place. / exposed to risk

Without making a noise, silently.

(idiomatic) to initiate a chain of events necessary to help one achieve a goal (more quickly)

(mathematics, of a subset of a topological space) Having no isolated points.

All possible knowledge of a subject matter. / All possible means, both honest and dishonest

Properly aligned; in alignment.