Final answer:
The base word of 'involvement' is 'involve', meaning to include or engage someone or something in a particular activity or situation.
Step-by-step explanation:
The base word of the word 'involvement' is 'involve'. The base word is the simplest form of a word from which other forms are derived. In this case, 'involvement' is derived from the base word 'involve', which means to include or engage someone or something in a particular activity or situation.