Savvy generally means being knowledgeable and practical, especially in handling real-world situations. It can refer to both a noun and an adjective depending on usage. Key shades of meaning:

• Practical understanding: having clear, useful knowledge about how things work or how to handle tasks effectively.
• Shrewdness or good judgment: the ability to make sensible decisions, often in financial, social, or problem-solving contexts.
• Street-smarts or being well-informed in a specific area: for example, “tech-savvy” (skilled with technology) or “business-savvy” (clever in business decisions).

Usage notes:

• As an adjective: savvy or savvier/savviest describe someone who is practical and astute in a given domain (e.g., a savvy investor, a savvy shopper).
• As a noun: “savvy” can refer to practical knowledge or the ability to understand something (e.g., “He has a lot of savvy when it comes to managing projects.”).

If you’d like, I can tailor the definition to a particular context (education, business, tech, etc.) or provide example sentences.