Sentence:  The underlying assumption , of course , is that only sight and touch enable us , in any precise and <WSD>fully</WSD> dependable way , to locate objects in space beyond us , the other senses being decidedly inferior , if not totally inadequate , in this regard . 
Meaning of the word marked with <WSD> tags:  to the greatest degree or extent; completely or entirely; (`full' in this sense is used as a combining form)