Used to indicate a minimum amount or degree, similar to 少なくとも. Slightly more formal or literary than 少なくとも.
I want to go at least once.
At least a hundred people gathered.
Rare variant using the uncommon kanji 尠.
Derived from the adjective 少ない (few, little) with the particle も, forming an adverbial phrase meaning 'even if little' → 'at least'.