Guru/ˈɡuːruː/ Definition 1 of 3Pro Tip 1/3Modern Expertise Refers to someone with deep knowledge in newer fields like technology or business. She's a marketing guru who can help our brand grow. Pro Tip 2/3Colloquial Use 'Guru' is often used informally to describe someone who's the go-to person for advice. Ask Jon, he's our computer guru. Pro Tip 3/3Respected Figure Conveys a level of respect and admiration for the person's skill and knowledge. Our coding guru just solved a problem we've had for weeks.