Initial

anfänglich

(chronologically first)

anfänglich

(spatially first)

erster

(spatially first)

ursprünglich

(chronologically first)

Anfangsbuchstabe

(first letter of a word)

Initial

(calligraphy: distinguished initial letter)

Initiale

(first letter of a word)

Initiale

(first letters of a person's name as a unit)

Initiale

(calligraphy: distinguished initial letter)

abzeichnen

(to sign one's initial(s))

paraphrasieren

(to sign one's initial(s))