We found 3 dictionaries that define the word in one's head:

General (3 matching dictionaries)

1. in one's head: Merriam-Webster
2. in one's head: Oxford Learner's Dictionaries
3. in one's head: Wiktionary

Phrases: have eyes in the back of ones head, to be lost in ones own head, to be elsewhere in ones head, more... ▸ Words similar to in one's head ▸ Usage examples for in one's head ▸ Idioms related to in one's head ▸ Wikipedia articles (New!) ▸ Words that often appear near in one's head ▸ Rhymes of in one's head ▸ Invented words related to in one's head