fiber optics (US), fibre optics (UK)

speciality/specialty; subject of study; subject of expertise; area of interest; profession

(business) a company

to research, to study

a piece of research, a study, investigation

(chiefly women's speech) first person singular pronoun: I, me

private; mine

(polite) first-person singular pronoun: I, me

a personal or private matter / (by extension) selfishness

a personal or private matter / selfishness / privacy, secrecy / (women's speech, obsolete) a brother-in-law