initial >> ɪˈnɪʃ(ə)l
Definition: [adjective] existing or occurring at the beginning.
Example: our initial impression was favourable
Definition: [noun] the first letter of a name or word, typically a person's given name or a word forming part of a phrase.
Example: they carved their initials into the tree trunk
Definition: [verb] mark or sign (a document) with one's initials in order to authorize or validate it.
Example: the man initialled the three warrants