certain is an English word with multiple meanings:
1. Used to refer to a particular person or thing without naming them specifically
2. Sure to happen or be true
3. Having no doubt about something
4. Some but not all
Common phrases:
- a certain (used before a noun to indicate that the speaker is not referring to a specific person or thing)
- for certain (without doubt)
- make certain (to ensure that something happens or is true)