"Given that" is a common phrase used to introduce a condition or fact before presenting an argument, but there are many synonyms that can be used instead. Some alternatives include "considering," "in light of," "due to," "in view of," "according to," "based on," "taking into account," "keeping in mind," "owing to," and "because of." Using synonyms for "given that" can help to vary the language and make the writing more engaging for the reader. It's important to choose the most appropriate synonym for the context to ensure clarity and accuracy in the message being conveyed.