I have not come across this issue before; so my guess is as good or as bad as yours. My inclination would be to read the word as meaning curriculum vitae. In other words a list of the main events in your wife's life relevant to immigration to Canada: birth, schooling, university, work, addresses, engagement, marriage, birth of children, date of submission of application etc. You do not say what country you are in but query whether there is a country specific requirement applicable to her?