少なくとも + [sentence]
少なくとも + [quantity/number] + は
Standalone adverb; typically placed at the beginning of a clause or before a quantity/number phrase.
少なくとも means "at least" and is used to set a minimum amount, number, degree, or expectation. It functions as an adverb and can modify quantities, frequencies, or entire statements. It is the formal/written equivalent of the more colloquial すくなくて少なくても.
The word is derived from the い-adjective すくない少ない (few/little) in its く-form combined with とも (even if), literally meaning "even if it is few/little" – in other words, "at the very least."
少なくとも is used before a number or amount to indicate the minimum.
It can also be used more broadly to express what one considers to be the bare minimum or baseline expectation, not necessarily tied to a specific number.
少なくとも typically appears at the beginning of a sentence or directly before the phrase it modifies. When placed at the start of a sentence, it often sets the tone for the entire statement, emphasizing a minimum condition.