- Sill (geology) , a tabular mass of igneous rock that has been intruded laterally between layers of older rock
- Architecture , a is the bottom edge of a Window ; in Construction , it is the bottom horizontal member of a wall or building to which vertical members are attached
- Construction , the bottom horizontal member of a wall or building to which vertical members are attached
- Sill River , a tributary to the Inn River in Austria
- Judee Sill , an American singer and songwriter
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