Theory of Machine
The two elements of a pair are said to form a higher pair, when they

Permit relative motion
Are kept in contact by the action of external forces, when in motion
Have a surface contact when in motion
Have a line or point contact when in motion

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Theory of Machine
In a hydrodynamic journal bearing, there is

No lubricant between the journal and the bearing
A very thin film of lubricant between the journal and the bearing such that there is contact between the journal and the bearing
A forced lubricant between the journal and the bearing
A thick film of lubricant between the journal and the bearing

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