The term 'ALL AT FIRST' can be solved by the word 'OMNI', which is a four-letter word. The word 'OMNI' is derived from Latin and means 'all'. It is often used to describe something that is all-encompassing or all-inclusive. In other words, it is used to describe something that encompasses all aspects of a particular thing. For example, an omnibus bill is a single piece of legislation that covers multiple topics.