enter upon something Definition

enter
verb entered, entering

tr & intr
1. To go or come in or into (eg a room).

Thesaurus: penetrate, invade, intrude, insert, pierce; Antonym: leave.
tr & intr
2. To register (another person, oneself, one's work, etc) in a competition.

Thesaurus: enrol, enlist, sign up, register.
3. To record something in a book, diary, etc.
4. To join (a profession or society, etc).
5. To submit or present something.

Example: enter a complaint
intr
6. theat.
To come on to the stage.

Derivative: enterable
adj

Derivative: enterer
noun

Etymology: 13c: from French entrer, from Latin intrare, from intra within.

Phrasal Verb: enter into something

To begin to take part in it.To become involved in it; to participate actively or enthusiastically in it.To agree to be associated in or bound by (eg an agreement).

Phrasal Verb: enter on or upon something

To begin (an undertaking, especially a lengthy one).
Example: enter upon a new stage of life