"initially"的近义词包括：

ab initio

at first

at the start

firstly

这些词都表示“最初”或“开头”的意思，可以在不同的语境中替换"initially"使用。例如：

We need to understand the problem initiallybefore we can find a solution.

The project began initiallywith a small team of developers.

Initially, the plan was to build a bridge over the river, but it was later changed to a tunnel.

希望这些信息对你有所帮助。