breathing in(n = noun.act) aspiration, inhalation, inspiration, intake - the act of inhaling; the drawing in of air (or other gases) as in breathing;
is a kind of breath
is a part of breathing, external respiration, respiration, ventilation
has particulars: gasp, pant, drag, puff, pull

abdominal breathing, breathing, breathing apparatus, breathing device, breathing machine, breathing out, breathing place, breathing room, breathing space, breathing spell, breathing time, periodic breathing, self-contained underwater breathing apparatus