1. (Chron.) Inserted or introduced among others in the calendar; as, an intercalary month, day, etc.; -- now applied particularly to the odd day (Feb. 29) inserted in the calendar of leap year. See Bissextile, n. [ 1913 Webster ]

2. Introduced or inserted among others; additional; supernumerary. “Intercalary spines.” Owen. [ 1913 Webster ]

This intercalary line . . . is made the last of a triplet. Beattie. [ 1913 Webster ]

Intercalary day (Med.), one on which no paroxysm of an intermittent disease occurs. Mayne. [ 1913 Webster ]

1. (Chron.) To insert, as a day or other portion of time, in a calendar. [ 1913 Webster ]

2. To insert among others, as a verse in a stanza; specif. (Geol.), to introduce as a bed or stratum, between the layers of a regular series of rocks. [ 1913 Webster ]

Beds of fresh-water shells . . . are intercalated and interstratified with the shale. Mantell. [ 1913 Webster ]

1. (Chron.) The insertion of a day, or other portion of time, in a calendar. [ 1913 Webster ]

2. The insertion or introduction of anything among others, as the insertion of a phrase, line, or verse in a metrical composition; specif. (Geol.), the intrusion of a bed or layer between other layers. [ 1913 Webster ]

Intercalations of fresh-water species in some localities. Mantell. [ 1913 Webster ]

1. To pass between; to intervene. [ Obs. ] [ 1913 Webster ]

He supposed that a vast period interceded between that origination and the age wherein he lived. Sir M. Hale. [ 1913 Webster ]

2. To act between parties with a view to reconcile differences; to make intercession; to beg or plead in behalf of another; to mediate; -- usually followed by with and for or on behalf of; as, I will intercede with him for you. [ 1913 Webster ]

I to the lords will intercede, not doubting
Their favorable ear. Milton.

Syn. -- To mediate; arbitrate. See Interpose. [ 1913 Webster ]

Intercentral nerves (Physiol.), those nerves which transmit impulses between nerve centers, as opposed to peripheral fibers, which convey impulses between peripheral parts and nerve centers. [ 1913 Webster ]

1. To take or seize by the way, or before arrival at the destined place; to cause to stop on the passage; as, to intercept a letter; a telegram will intercept him at Paris. [ 1913 Webster ]

God will shortly intercept your breath. Joye. [ 1913 Webster ]

2. To obstruct or interrupt the progress of; to stop; to hinder or oppose; as, to intercept the current of a river. [ 1913 Webster ]

Who intercepts me in my expedition? Shak. [ 1913 Webster ]

We must meet first, and intercept his course. Dryden. [ 1913 Webster ]

3. To interrupt communication with, or progress toward; to cut off, as the destination; to blockade. [ 1913 Webster ]

While storms vindictive intercept the shore. Pope. [ 1913 Webster ]

4. (Math.) To include between; as, that part of the line which is intercepted between the points A and B.

5. To overhear or view (a communication or message intended for another), without hindering its passage; as, to intercept a telephone call. [ PJC ]

6. (Sports) To catch and take possession of (a ball passed between members of an opposing team); as, the back intercepted the pass and ran the ball back for a touchdown. [ PJC ]

Syn. -- To cut off; stop; catch; seize; obstruct. [ 1913 Webster ]

2. (Mil.) A high-speed fighter airplane with fast-climbing capability, used to intercept enemy airplanes or identify unknown aircraft and engage them in combat if necessary; also, a missile which intercepts and destroys incoming missiles or airplanes. [ PJC ]

But the Spirit itself maketh intercession for us with groanings which can not be uttered. Rom. viii. 26. [ 1913 Webster ]

1. One who goes between, or intercedes; a mediator. (a) One who interposes between parties at variance, with a view to reconcile them. (b) One who pleads in behalf of another. Milton. [ 1913 Webster ]

2. (Eccl.) A bishop, who, during a vacancy of the see, administers the bishopric till a successor is installed. [ 1913 Webster ]

Two bosoms interchained with an oath. Shak. [ 1913 Webster ]

1. To put each in the place of the other; to give and take mutually; to exchange; to reciprocate; as, to interchange places; they interchanged friendly offices and services. [ 1913 Webster ]

I shall interchange
My waned state for Henry's regal crown. Shak. [ 1913 Webster ]

2. To cause to follow alternately; to intermingle; to vary; as, to interchange cares with pleasures. [ 1913 Webster ]

1. The act of mutually changing; the act of mutually giving and receiving; exchange; as, the interchange of civilities between two persons. “Interchange of kindnesses.” South. [ 1913 Webster ]

2. The mutual exchange of commodities between two persons or countries; barter; commerce. Howell. [ 1913 Webster ]

3. Alternate succession; alternation; a mingling. [ 1913 Webster ]

The interchanges of light and darkness. Holder. [ 1913 Webster ]

Sweet interchange
Of hill and valley, rivers, woods, and plains. Milton. [ 1913 Webster ]

4. An intersection between highways, having two or more levels and a series of connecting roadways so that traffic on one highway may pass over or under the other highway without crossing through the line of traffic, and vehicles may pass from one highway to the other while traffic on both highways continues uninterrupted. A common interchange is the cloverleaf. [ PJC ]

1. Admitting of exchange or mutual substitution. “Interchangeable warrants.” Bacon. [ 1913 Webster ]

2. Following each other in alternate succession; as, the four interchangeable seasons. Holder.

-- In`ter*change"a*ble*ness, n. -- In`ter*change"a*bly, adv. [ 1913 Webster ]

So all passage of external air into the receiver may be intercluded. Boyle. [ 1913 Webster ]