What does strictē mean in Latin?

strictē, a adverb, means “closely, tightly; concisely; strictly”.

adverb

strictē

strictē (comparative strictius, superlative strictissimē)

closely, tightly
concisely
ita nos habitum ipsum orationis virilem et illam vim stricte robusteque dicendi tenera quadam elocutionis cute operimus […]In this manner we conceal the manly character of oration and the strength of speaking concisely and firmly with a delicate surface of expression […]c. 95 CE, Quintilianus, Institutio oratoria 5.12.18
strictly
Quantus tremor est futurus, Quando Iudex est venturus,How great will be the tremor, when justice comes, strictly examining all things!c. 13th century, Dies irae

strictē, adv., v. stringo,

I. P. a. fin.