The term 'gratify completely' can be solved by two crossword solutions, SATIATE (7 letters) and SATE (4 letters). SATIATE is derived from the Latin word satiare, which means to satisfy or fill to the full. It is often used to describe a feeling of being completely satisfied after eating a large meal. SATE is a verb meaning to satisfy or gratify to the fullest extent. It is similar to the word SATIATE, but it implies a more intense level of satisfaction. Both words are used to describe a feeling of being completely satisfied or gratified.