--- title: "Glossary" description: "Definitions of the terms Calendar0 uses — menubar, provider, account, free/busy, booking link, conflict calendar, AI command and more" last_updated: 2026-09-01 canonical_url: https://www.calendar0.app/docs/glossary --- # Glossary Definitions of the terms Calendar0 uses — menubar, provider, account, free/busy, booking link, conflict calendar, AI command and more Short definitions of the terms used across the Calendar0 app, documentation and blog. Terms are alphabetical. ## Account One signed-in calendar login — for example a Google Workspace account or a personal iCloud account. Calendar0 can connect several accounts at once and shows their calendars together. See [Connecting Calendars](/docs/getting-started/connecting-calendars). ## AI command A natural-language instruction typed into the chat tab, such as `lunch with Sarah tomorrow at noon` or `am I free at 2pm?`. Calendar0 turns it into a calendar action (create, move, cancel, look up) and shows what it will do before sending any invite. The Starter plan includes 3 free commands; paid plans are unlimited. See [Natural Language Tips](/docs/ai-assistant/natural-language-tips). ## Availability (free/busy) Whether a person is free or has an event in a given time range. Calendar0 checks availability across every connected account before scheduling, and across every attendee it can see, to avoid double-booking. See [Finding Time](/docs/ai-assistant/finding-time). ## Booking link A public page (`calendar0.app/book//`) where someone can pick a free slot in your calendar without emailing back and forth. Each link has its own duration, availability windows and meeting location. ## Buffer Empty time deliberately kept between two meetings — for example 10 minutes after a call. Bulk operations can add buffers to a whole day of back-to-back meetings at once. ## Bulk operation Selecting several events and changing them together: adding buffers, moving them, or resizing them. See [Managing Events](/docs/ai-assistant/managing-events). ## Calendar A single named list of events inside an account — for example "Work", "Personal" or a shared team calendar. An account usually has several calendars; you choose which ones Calendar0 displays. ## Conflict calendar A calendar that is hidden from the grid but still counts as "busy" when checking availability or booking. Useful for a partner's or a second job's calendar that should block time without cluttering your view. ## Contact resolution How the AI turns a partial name (`Sarah`) into an email address, by searching Google Contacts, Google Workspace and the Microsoft directory. See [Scheduling Meetings](/docs/ai-assistant/scheduling-meetings). ## Default calendar The calendar new events are written to when you don't name one. Set per account in Settings. ## Lifetime Access The one-time $49 (USD) plan: unlimited AI commands and all future AI improvements, with a 14-day money-back guarantee. Compare plans on the [pricing section of the homepage](/#pricing). ## Menubar / system tray The strip of small icons next to the clock — top-right on macOS ("menubar"), bottom-right on Windows ("system tray"). Calendar0 lives there so your schedule is one click away without opening a browser. ## Provider The service that hosts a calendar: Google Calendar, Microsoft 365 / Outlook, or Apple Calendar (iCloud). Google and Microsoft connect with OAuth, so Calendar0 never sees those passwords; Apple connects over CalDAV with an [app-specific password](https://support.apple.com/en-us/HT204397) rather than your Apple ID password. ## RSVP Accepting, declining or tentatively accepting an invitation. Calendar0 lets you RSVP from the event card without opening the provider's web app. ## Starter plan The free plan: unlimited providers and calendars, full event editing, notifications, one-click video-call join, and 3 AI commands. ## Token The credential that lets Calendar0 read and write your calendar on your behalf — an OAuth token for Google and Microsoft, the app-specific password for Apple. The desktop app keeps it in your operating system's secure storage (Keychain on macOS, Credential Manager on Windows); the web app and booking links keep it encrypted at rest in Calendar0's account store. ## Sitemap See the [sitemap](https://www.calendar0.app/sitemap.md) for the marketing, documentation and blog pages on https://www.calendar0.app, or [llms.txt](https://www.calendar0.app/llms.txt) for the agent-oriented index.