1) high up in the air (especially at the top of a ship) (aloft)

2) tiny drops of moisture produced on cool surfaces from water vapour in the air (dew)

3) (of a bird) to remain in the air in one place; (of a person) to wait nearby (hover)

4) (of disease) that can be spread by means of bacteria carried in the air or in water (infectious)

5) (to cause a person, thing) to rise and float in the air (levitate)