transitive. To turn one's thoughts to, fix the mind on (something); to attend to; to occupy oneself with; to look after. Obsolete.

intransitive. To be occupied with (a subject) in thought; to dwell on; = to run on —— 1b at phrasal verbs 2. Now rare.

intransitive. Of the mind, thoughts, etc.: to be occupied, concerned, or taken up with (a subject); to concentrate on; to dwell on.

intransitive. Of the mind, thoughts, etc.; to be occupied, concerned, or taken up with; = to run on —— 1b at phrasal verbs 2.

intransitive. To keep at or attend to (a task, occupation, or activity); to persevere with.

transitive. To fix (the desires or mental faculties) on something; to concentrate or direct (one's mind, emotions, etc.). Usually with on, to, upon.

transitive. = meditate, v. 3a.

absol. To concentrate one's attention or mind on. Also intransitive for reflexive (said of the eyes, attention, etc.).

transitive. To fix one's attention upon; to observe intently or with interest. Now rare.

figurative (with a preposition as on, over, round): To dwell upon, give protracted consideration to, be reluctant to quit (a subject).