transitive. To keep (a day, festival, etc.) holy; to observe solemnly.

transitive. To keep (a holy day) free from work; to celebrate.

transitive. To observe, keep (a holy day). Obsolete.

transitive. To keep, observe (something prescribed).

To observe with due formality and in the prescribed manner (any religious rite, ceremony, service, feast, fast, or other occasion); to celebrate…

transitive. To observe (a holy day, festival, etc.) publicly and formally, esp. with religious rites or formal ceremonies.

transitive. To perform or celebrate duly or in a prescribed manner (a rite, ceremony, etc.); to mark or acknowledge (a festival, anniversary…

To keep (a day, etc.) holy; to keep or observe as holy. = hallow, v.1 4.