"Mitigate" = to reduce, lessen, or alleviate; "militate" = to work against, to be a strong factor opposing something.
Transitive verb: to reduce the severity, intensity, or negative impact of something. "Mitigate risks" = reduce risks. "Mitigate damage" = lessen the damage. In law: to reduce a sentence due to circumstances. Always implies making something LESS severe.
The company took several steps to mitigate the environmental impact of its operations.
Wearing sunscreen every day significantly mitigates the risk of skin cancer.
The judge considered several mitigating factors before determining the sentence.
Intransitive verb: to work as a strong force against something. "Militate against" = to act as an obstacle to, to oppose powerfully. From "miles" (Latin for soldier). Almost always appears with "against": "militate against success".
His lack of local market knowledge militates against his chances of success in the new region.
The extreme cold weather militates against outdoor construction during January and February.
Her strong accent militated against her in the original audition, though her talent was undeniable.
Common mistake
The most common error: "mitigate against" is a grammatical mistake because "mitigate" is transitive and needs no preposition. "Mitigate the risk" (correct), not "mitigate against the risk". "Militate" almost always requires "against". Remember: you militate AGAINST something. You mitigate something directly (no preposition).
Trick to remember it
MITIGATE = Make It Gentle And Tolerable (to Ease). Takes a direct object: "mitigate the risk." MILITATE = Military AT-tack against. Takes "against": "militate against the plan." If you see "against" after the verb in your sentence, it should almost certainly be MILITATE, not mitigate. "Mitigate against" is always wrong.
Quick rule
Mitigate = to reduce or lessen (mitigate risk = reduce risk, no preposition needed). Militate = to work against (militate against = to actively oppose, always used with "against").
Did you know?
"Mitigate against" is one of the most common grammatical errors in formal English and journalism. The Oxford English Dictionary documents it as a hybrid error blending "militate against" with "mitigate". Even native speakers with university education make this mistake. In legal and diplomatic English, the distinction is critical.
Exercise 1 · Pick the right one
Installing solar panels and improving insulation can help to _____ the impact of rising energy costs on the household budget.
Exercise 2 · Pick the right one
His long criminal history will almost certainly _____ against receiving a lenient sentence from the judge.
Exercise 3 · Form the word
Mitigate = to reduce or lessen (mitigate risk = reduce risk, no preposition needed). Militate = to work against (militate against = to actively oppose, always used with "against").
The most common error: "mitigate against" is a grammatical mistake because "mitigate" is transitive and needs no preposition. "Mitigate the risk" (correct), not "mitigate against the risk". "Militate" almost always requires "against". Remember: you militate AGAINST something. You mitigate something directly (no preposition).
MITIGATE = Make It Gentle And Tolerable (to Ease). Takes a direct object: "mitigate the risk." MILITATE = Military AT-tack against. Takes "against": "militate against the plan." If you see "against" after the verb in your sentence, it should almost certainly be MILITATE, not mitigate. "Mitigate against" is always wrong.
Bryan López
Founder of SpeakUP Academy