under

1. in, at, or to a position down from; lower than; below shoes under the bed, under a blazing sun
2. beneath the surface of under water
3. below and to the other side of we drove under a bridge
4. covered, surmounted, enveloped, or concealed by to wear a vest under a coat
5. 1. lower in authority, position, power, etc. than
   2. lower in value, amount, etc. than; less than
   3. lower than the required or standard degree of under the age specified for the job
6. in a position or condition regarded as lower than or inferior to, or implying subordination to; specif.,
   1. subject to the control, limitations, government, direction, instruction, or influence of under orders from the President, under oath, born under Aries
   2. burdened, oppressed, or distressed by under a strain
   3. subjected to; undergoing under an anesthetic, under repair
7. with the character, pretext, disguise, or cover of under an alias
8. in or included in (the designated category, division, class, etc.) spiders are classified under arachnids
9. during the rule of literature flourished under Elizabeth I
10. being the subject of the question under discussion
11. having regard for; because of under the circumstances
12. authorized or attested by under her signature
13. planted with; sown with an acre under corn

Etymology: ME < OE, akin to Ger unter < IE *ṇdhos, *ṇdheri, under > L infra, below

adverb

1. in or to a position below something; beneath
2. beneath the surface, as of water
3. in or to a condition that is subordinate
4. so as to be covered or concealed
5. less in amount, value, etc.; not so much costing two dollars or under

adjective

lower in position, authority, rank, amount, degree, etc.