|Noah Webster's Dictionary|
1. (adv.) In a critical manner; with nice discernment; accurately; exactly.
2. (adv.) At a crisis; at a critical time; in a situation, place, or condition of decisive consequence; as, a fortification critically situated.
Critically (1 Occurrence)
1 Samuel 31:3 The battle went sore against Saul, and the archers overtook him; and he was greatly distressed by reason of the archers. (See NIV)