Final answer:
The word 'bifocal' is not related to the root 'loc-', unlike 'allocate', 'dislocate', and 'locomotion' which all pertain to place or location. 'Bifocal' originates from Latin meaning a lens with two focuses.
Step-by-step explanation:
The root word 'loc-' is related to place or location. Hence, it's present in words like 'allocate' (distribute resources to specific places), 'dislocate' (move something from its proper place), and 'locomotion' (the ability to move from one place to another). However, the word 'bifocal' does not relate to the root 'loc-'. It comes from Latin, where 'bi-' means two and 'focal' relates to the focus or point, thus it denotes a lens that has two focuses.
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